Note 11 - Related Party Transactions (Details Textual) - USD ($)		3 Months Ended		9 Months Ended		120 Months Ended
	Aug. 08, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Payments to Acquire Equity Method Investments				$ 2,500,000
InControl Medical [Member] | Membership Unit Subscription Agreement [Member]
Payments to Acquire Equity Method Investments	$ 2,500,000
Stellartech Research Corporation [Member]
Stock Issued During Period, Shares, New Issues						37,500
Related Party Transaction, Amounts of Transaction		$ 2,620,000	$ 1,816,000	6,326,000	$ 3,976,000
Accounts Payable, Related Parties, Current		$ 781,000		$ 781,000		$ 781,000	$ 1,297,000