Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Revenue Recognition - Disaggregated Revenue by Revenue Stream (Details)

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Note 3 - Revenue Recognition - Disaggregated Revenue by Revenue Stream (Details) - Customer Concentration Risk [Member]
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Third-Party Payor Rental Revenue [Member]        
Revenue 49.40% 47.50% 48.80% 48.00%
Director Payer Rentals [Member]        
Revenue 33.00% 38.10% 33.80% 38.50%
Revenue, Product and Service Benchmark [Member]        
Revenue 17.60% 14.40% 17.40% 13.50%
Revenue from Contract with Customer Benchmark [Member]        
Revenue 100.00% 100.00% 100.00% 100.00%