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 9 Months Ended 50 Months Ended
Aug. 08, 2017
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Income (Loss) from Equity Method Investments, Total   $ (33,000) $ (55,000) $ (188,000) $ (323,000)    
InControl Medical [Member]              
Equity Method Investment, Ownership Percentage   7.00%   7.00%   7.00%  
Income (Loss) from Equity Method Investments, Total   $ 33,000 $ 55,000 $ 188,000 $ 323,000    
InControl Medical [Member] | Membership Unit Subscription Agreement [Member]              
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased   40 185 140 425 5,425  
Unrecorded Unconditional Purchase Obligation, Purchases   $ 5,000 $ 26,000 $ 17,000 $ 46,000    
Payments for Purchase of Products   7,000 $ 10,000 17,000 $ 30,000    
Accounts Payable, Related Parties, Current   $ 0   $ 0   $ 0 $ 0
Payments to Acquire Equity Method Investments $ 2,500,000