Note 10 - Stock Repurchase Plan (Details Textual) - USD ($) $ in Thousands	6 Months Ended		20 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Oct. 27, 2015
Stock Repurchase Program, Authorized Amount				$ 5,000
Stock Repurchased and Retired During Period, Value	$ 62	$ 770	$ 1,195
Stock Repurchased and Retired During Period, Shares	13,883	190,725	297,020