Note 13 - Commitments and Contingencies Commitment for Non Cancelable Operating Leases in Future Years (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 5,700	$ 5,000	$ 5,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	6,482
Operating Leases, Future Minimum Payments, Due in Two Years	9,002
Operating Leases, Future Minimum Payments, Due in Three Years	8,929
Operating Leases, Future Minimum Payments, Due in Four Years	8,275
Operating Leases, Future Minimum Payments, Due in Five Years	8,162
Operating Leases, Future Minimum Payments, Due Thereafter	58,396
Operating Leases, Future Minimum Payments Due	99,246
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	$ 0