Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]
Income Tax Examination, Year under Examination	2014
Income Tax Expense (Benefit)		$ 926	$ 2,447	$ 1,270	$ 2,983
Effective Income Tax Rate Reconciliation, Percent		7.60%	23.70%	5.50%	17.70%
Tax Adjustments, Settlements, and Unusual Provisions			$ 2,700
Unrecognized Tax Benefits		$ 14,000		$ 14,000		$ 12,100
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		3,800		3,800		2,700
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		$ 300		$ 300		$ 200