Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Debt (Details Textual)

v3.21.1
Note 8 - Debt (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 05, 2021
USD ($)
Apr. 15, 2019
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Feb. 04, 2020
USD ($)
Revolving Credit Facility [Member]          
Long-term Line of Credit, Total     $ 32,000 $ (0)  
Letters of Credit Outstanding, Amount     800 800  
Line of Credit Facility, Current Borrowing Capacity     $ 75,000 11,750  
The 2021 Credit Agreement [Member]          
Percentage of Total Depreciation Expense 50.00%        
Debt Instrument, Covenant, Minimum Fixed Coverage Ratio 1.20        
Debt Instrument, Covenant, Maximum Leverage Ratio 3.50        
The 2021 Credit Agreement [Member] | Eurodollar Loan [Member]          
Debt Instrument, Interest Rate, Effective Percentage     2.11%    
LIBOR Rate     0.11%    
The 2021 Credit Agreement [Member] | Eurodollar Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.00%   2.00%    
The 2021 Credit Agreement [Member] | Eurodollar Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.00%   2.00%    
The 2021 Credit Agreement [Member] | Eurodollar Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 3.00%   3.00%    
The 2021 Credit Agreement [Member] | ABR Loans [Member]          
Debt Instrument, Interest Rate, Effective Percentage     4.25%    
Lender Prime Rate     3.25%    
The 2021 Credit Agreement [Member] | ABR Loans [Member] | Base Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%   1.00%    
The 2021 Credit Agreement [Member] | ABR Loans [Member] | Base Rate [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%   1.00%    
The 2021 Credit Agreement [Member] | ABR Loans [Member] | Base Rate [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.00%   2.00%    
The 2021 Credit Agreement [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 75,000        
Line of Credit Facility, Additional Borrowing Capacity Subject to Certain Conditions 25,000        
Proceeds from Long-term Lines of Credit 30,000        
The 2021 Credit Agreement [Member] | Letter of Credit [Member]          
Line of Credit Facility, Maximum Borrowing Capacity 7,000        
The 2015 Credit Agreement [Member]          
Long-term Line of Credit, Total         $ 800
The 2015 Credit Agreement [Member] | Revolving Credit Facility [Member]          
Repayments of Long-term Lines of Credit $ 8,200        
Three Term Notes Associated With the 2015 Credit Agreement [Member]          
Debt Instrument, Face Amount       $ 37,900  
Credit Facility [Member] | Eurodollar Loan [Member]          
Debt Instrument, Interest Rate, Effective Percentage       2.19%  
LIBOR Rate       0.19%  
Credit Facility [Member] | Eurodollar Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate       2.00%  
Credit Facility [Member] | Eurodollar Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate       2.00%  
Credit Facility [Member] | Eurodollar Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate       3.00%  
Credit Facility [Member] | CB Floating Rate Loan [Member]          
Debt Instrument, Interest Rate, Effective Percentage       2.25%  
Credit Facility [Member] | CB Floating Rate Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate, Before Margin Rate       2.50%  
Credit Facility [Member] | CB Floating Rate Loan [Member] | Greater of Prime Rate or LIBOR Plus 2.5% [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate       1.00%  
Credit Facility [Member] | CB Floating Rate Loan [Member] | Greater of Prime Rate or LIBOR Plus 2.5% [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate       0.25%  
Credit Facility [Member] | CB Floating Rate Loan [Member] | CB Floating Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate       (1.00%)  
Lender Prime Rate       3.25%  
Credit Facility [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity       $ 11,800  
Letters of Credit Outstanding, Amount       1,000  
Line of Credit Facility, Borrowing Base       $ 15,600  
Financing Agreement [Member] | Medical Equipment [Member]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,000      
Debt Instrument, Term (Month)   36 months      
Line of Credit Facility, Current Borrowing Capacity     $ 800