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Note 4 - Investment in Limited Liability Company (Details Textual)		3 Months Ended		32 Months Ended
	Aug. 08, 2017 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Income (Loss) from Equity Method Investments, Total		$ (182,000)	$ (125,000)
InControl Medical [Member]
Equity Method Investment, Ownership Percentage		7.00%		7.00%
Income (Loss) from Equity Method Investments, Total		$ 182,000	$ 125,000
InControl Medical [Member] \| Membership Unit Subscription Agreement [Member]
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased		120	300	4,920
Unrecorded Unconditional Purchase Obligation, Purchases		$ 10,000	$ 27,000
Payments for Purchase of Products		10,000	$ 27,000
Accounts Payable, Related Parties, Current		$ 0		$ 0	$ 0
Payments to Acquire Equity Method Investments	$ 2,500,000