Note 13 - Share Repurchase Program (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Treasury Stock, Shares, Acquired	91,303	41,322
Treasury Stock Acquired, Average Cost Per Share	$ 27.77	$ 35.31
Treasury Stock Value Acquired Weighted Average Method	$ 2,536	$ 1,459
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	263,877