Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Investment in Limited Liability Company (Details Textual)

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Note 4 - Investment in Limited Liability Company (Details Textual)
3 Months Ended 32 Months Ended
Aug. 08, 2017
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Income (Loss) from Equity Method Investments, Total   $ (182,000) $ (125,000)    
InControl Medical [Member]          
Equity Method Investment, Ownership Percentage   7.00%   7.00%  
Income (Loss) from Equity Method Investments, Total   $ 182,000 $ 125,000    
InControl Medical [Member] | Membership Unit Subscription Agreement [Member]          
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased   120 300 4,920  
Unrecorded Unconditional Purchase Obligation, Purchases   $ 10,000 $ 27,000    
Payments for Purchase of Products   10,000 $ 27,000    
Accounts Payable, Related Parties, Current   $ 0   $ 0 $ 0
Payments to Acquire Equity Method Investments $ 2,500,000