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

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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