Note 12 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	80.00%
Defined Contribution Plan, Cost Recognized	$ 0	$ 4,800	$ 2,300