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 6 Months Ended 47 Months Ended
Aug. 08, 2017
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Income (Loss) from Equity Method Investments, Total   $ (79,000) $ (86,000) $ (155,000) $ (268,000)    
InControl Medical [Member]              
Equity Method Investment, Ownership Percentage   7.00%   7.00%   7.00%  
Income (Loss) from Equity Method Investments, Total   $ 79,000 $ 86,000 $ 155,000 $ 268,000    
InControl Medical [Member] | Membership Unit Subscription Agreement [Member]              
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased   100 120 100 240 5,385  
Unrecorded Unconditional Purchase Obligation, Purchases   $ 12,000 $ 10,000 $ 12,000 $ 20,000    
Payments for Purchase of Products   10,000 $ 10,000 10,000 $ 20,000    
Accounts Payable, Related Parties, Current   $ 0   $ 0   $ 0 $ 0
Payments to Acquire Equity Method Investments $ 2,500,000