Note 14 - Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	$ 24,000
Operating Leases, Rent Expense	$ 800,000	$ 1,200,000	$ 1,800,000