Annual report pursuant to Section 13 and 15(d)

Note 5 - Investment in Limited Liability Company (Details Textual)

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Note 5 - Investment in Limited Liability Company (Details Textual)
12 Months Ended 17 Months Ended
Aug. 08, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Payments to Acquire Equity Method Investments   $ 2,500,000  
Income (Loss) from Equity Method Investments, Total   $ (657,000)  
InControl Medical [Member]        
Equity Method Investment, Ownership Percentage   9.00%   9.00%
Income (Loss) from Equity Method Investments, Total   $ (657,000)    
InControl Medical [Member] | Membership Unit Subscription Agreement [Member]        
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased   3,300 1,200 4,500
Payments for Purchase of Products   $ 327,000 $ 89,000 $ 416,000
Payments for Product Related Costs   $ 337,000 $ 94,000  
Payments to Acquire Equity Method Investments $ 2,500,000