Note 5 - Investment in Limited Liability Company (Details Textual)		12 Months Ended
Aug. 08, 2017 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 13, 2021 USD ($)
Income (Loss) from Equity Method Investments, Total		$ (256,000)	$ (383,000)
InControl Medical [Member]
Income (Loss) from Equity Method Investments, Total		$ 256,000	$ 383,000
InControl Medical [Member] \| Membership Unit Subscription Agreement [Member]
Payments to Acquire Equity Method Investments	$ 2,500,000
Equity Method Investment, Ownership Percentage	7.00%
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased		140	485
Unrecorded Unconditional Purchase Obligation, Purchases		$ 17,000	$ 51,000
Payments for Purchase of Products		$ 17,000	52,000
Accounts Payable, Related Parties, Current			$ 0	$ 0

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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