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Note 4 - Investment in Limited Liability Company (Details Textual)		3 Months Ended		6 Months Ended
	Aug. 08, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Income (Loss) from Equity Method Investments, Total		$ (138,000)	$ (158,000)	$ (263,000)	$ (407,000)
Membership Unit Subscription Agreement [Member] \| InControl Medical [Member]
Accounts Payable, Related Parties, Current		$ 0		$ 0		$ 0
InControl Medical [Member]
Equity Method Investment, Ownership Percentage		7.00%		7.00%
Income (Loss) from Equity Method Investments, Total		$ (138,000)		$ (263,000)
InControl Medical [Member] \| Membership Unit Subscription Agreement [Member]
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased				4,800
Payments for Purchase of Products		$ 27,000		$ 27,000
Payments to Acquire Equity Method Investments	$ 2,500,000