Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Revenue Recognition - Disaggregated Revenue by Revenue Stream (Details)

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Note 4 - Revenue Recognition - Disaggregated Revenue by Revenue Stream (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues, Total $ 24,463 $ 21,553
Customer Concentration Risk [Member] | Third-Party Payor Rental Revenue [Member]    
Percentage of total net revenues 52.30% 52.10%
Customer Concentration Risk [Member] | Direct Payer Rentals [Member]    
Percentage of total net revenues 33.10% 31.80%
Customer Concentration Risk [Member] | Revenue, Product and Service Benchmark [Member]    
Percentage of total net revenues 14.60% 16.10%
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]    
Percentage of total net revenues 100.00% 100.00%
Third-Party Payor Rental Revenue [Member]    
Revenues, Total $ 12,794 $ 11,236
Direct Payer Rentals [Member]    
Revenues, Total 8,086 6,859
Product Sales [Member]    
Revenues, Total $ 3,583 $ 3,458