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
Mar. 31, 2019
Mar. 31, 2018
Third-Party Payor Rental Revenue [Member]    
Revenue 48.10% 48.60%
Director Payer Rentals [Member]    
Revenue 34.70% 38.90%
Revenue, Product and Service Benchmark [Member]    
Revenue 17.20% 12.50%
Revenue from Contract with Customer Benchmark [Member]    
Revenue 100.00% 100.00%