Annual report pursuant to Section 13 and 15(d)

Note 2 - Summary of Significant Accounting Policies (Details Textual)

v3.19.1
Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Number of Operating Segments   1  
Number of Financial Institutions   2  
Inventory Valuation Reserves, Ending Balance   $ 100 $ 100
Medical Equipment in Rental Services, Useful Life   7 years  
Medical Equipment Held for Sale or Rental Reserves   $ 500 500
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0    
Capitalized Computer Software, Net, Ending Balance   0 200
Capitalized Computer Software, Amortization   2,300 3,100
Impairment of Long-Lived Assets Held-for-use   0 $ 1,000
Accounting Standards Update 2016-15 [Member]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   300  
Accounting Standards Update 2016-15 [Member] | Year Ended December 31, 2017 [Member]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 100  
Employee Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   0.1 0.5
Sales Revenue, Product Line [Member] | Customer Concentration Risk [Member]      
Concentration Risk, Percentage   15.70%  
Sales Revenue, Product Line [Member] | Customer Concentration Risk [Member] | National Association 2 [Member] | Oncology Business [Member]      
Concentration Risk, Percentage   7.00% 6.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | National Association 2 [Member]      
Concentration Risk, Percentage   4.00% 4.00%
Capital Leases [Member]      
Debt, Weighted Average Interest Rate   3.50%  
Computer Software, Intangible Asset [Member]      
Finite-Lived Intangible Asset, Useful Life   3 years  
Information Technology Software [Member]      
Property, Plant and Equipment, Useful Life   3 years  
Computer Equipment [Member]      
Property, Plant and Equipment, Useful Life   5 years  
Minimum [Member]      
Property, Plant and Equipment, Useful Life   3 years  
Minimum [Member] | Physician and Customer Relationships [Member]      
Finite-Lived Intangible Asset, Useful Life   15 years  
Minimum [Member] | Noncompete Agreements [Member]      
Finite-Lived Intangible Asset, Useful Life   2 years  
Minimum [Member] | Software Development [Member]      
Property, Plant and Equipment, Useful Life   3 years  
Maximum [Member]      
Property, Plant and Equipment, Useful Life   7 years  
Maximum [Member] | Physician and Customer Relationships [Member]      
Finite-Lived Intangible Asset, Useful Life   20 years  
Maximum [Member] | Noncompete Agreements [Member]      
Finite-Lived Intangible Asset, Useful Life   5 years  
Maximum [Member] | Software Development [Member]      
Property, Plant and Equipment, Useful Life   5 years