Note 5 - Investment in Limited Liability Company (Details Textual)		12 Months Ended
Aug. 08, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Income (Loss) from Equity Method Investments, Total		$ (627,000)	$ (657,000)
InControl Medical [Member]
Equity Method Investment, Ownership Percentage		7.00%
Income (Loss) from Equity Method Investments, Total		$ 627,000	$ 657,000
InControl Medical [Member] \| Membership Unit Subscription Agreement [Member]
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased		300	3,300
Unrecorded Unconditional Purchase Obligation, Purchases		$ 26,000	$ 327,000
Payments for Purchase of Products		$ 27,000	$ 337,000
Payments to Acquire Equity Method Investments	$ 2,500,000

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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