Note 4 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Amortization of Intangible Assets	$ 398	$ 176
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1,872
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,975
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1,959
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1,959
Finite-Lived Intangible Assets, Amortization Expense, Year Three	$ 1,975