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Note 4 - Investment in Limited Liability Company (Details Textual)		3 Months Ended
	Aug. 08, 2017 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Income (Loss) from Equity Method Investments, Total		$ (125,000)	$ (249,000)
Membership Unit Subscription Agreement [Member] \| InControl Medical [Member]
Accounts Payable, Related Parties, Current		$ 0		$ 0
InControl Medical [Member]
Equity Method Investment, Ownership Percentage		9.00%
Income (Loss) from Equity Method Investments, Total		$ 125,000
InControl Medical [Member] \| Membership Unit Subscription Agreement [Member]
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased		4,800
Payments for Purchase of Products		$ 27,000
Payments to Acquire Equity Method Investments	$ 2,500,000