Note 6 - Shareholders' Equity (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Mar. 10, 2016	Feb. 28, 2016	May 10, 2020	Mar. 01, 2020	Jan. 08, 2015	Jan. 07, 2015
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)					1,250,000
Stock Repurchase Program, Percentage of Outstanding Shares Authorized to be Repurchased						6.00%
Common Stock, Shares, Outstanding, Ending Balance (in shares)				20,518,823		20,945,634
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased (in shares)	1,000,000
Stock Repurchased During Period, Shares (in shares)		599,832
Stock Repurchased and Retired During Period, Value		$ 12,187
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				692,100
Subsequent Event [Member]
Stock Repurchase Program, Percentage of Outstanding Shares Authorized to be Repurchased			7.50%
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)			1,531,412