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Note 4 - Investment in Limited Liability Company (Details Textual)		3 Months Ended		56 Months Ended
	Aug. 08, 2017 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Income (Loss) from Equity Method Investments		$ (122,000)	$ (76,000)
InControl Medical [Member]
Income (Loss) from Equity Method Investments		$ (122,000)	$ (76,000)
InControl Medical [Member] \| Membership Unit Subscription Agreement [Member]
Payments to Acquire Equity Method Investments	$ 2,500,000
Equity Method Investment, Ownership Percentage		7.00%		7.00%
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased		0	0	5,425
Payments for Purchase of Products		$ 0	$ 0
Accounts Payable, Related Parties, Current		$ 0		$ 0	$ 0