Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	May 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 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)		$ 1,408	$ 2,103		$ 2,678	$ 5,086
Effective Income Tax Rate Reconciliation, Percent		8.90%	15.80%		6.90%	16.90%
Tax Adjustments, Settlements, and Unusual Provisions				$ 2,700
Unrecognized Tax Benefits		$ 14,200			$ 14,200		$ 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