Note 8 - Stock Repurchase Program (Details Textual) - USD ($) $ in Millions	1 Months Ended	3 Months Ended				8 Months Ended
	Dec. 31, 2016	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	[1]	Jul. 31, 2017
Stock Repurchase Program, Authorized Amount	$ 0.5
Treasury Stock, Shares, Acquired		0	80,426	49,920		130,346

[1] 49,920 shares of common stock purchased were purchased through a private transaction