Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Expense (Benefit)	$ (422)	$ (82)	$ (1,886)	$ 217
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation			$ 51
Effective Income Tax Rate Reconciliation, Percent			36.70%
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)			$ 29