Note 11 - Treasury Stock and Repurchase Program (Details Textual) - USD ($)		1 Months Ended		3 Months Ended
		Jan. 30, 2012	Jan. 31, 2011	Jul. 31, 2016	Jun. 30, 2016		May 31, 2016		Jul. 31, 2015		Sep. 19, 2012
September 2012 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount											$ 3,000,000
Former Repurchase Program [Member]
Treasury Stock, Shares, Acquired		85,219
Treasury Stock, Value, Acquired, Cost Method		$ 1,036,000
January 2011 Share Repurchase Program [Member]
Treasury Stock, Shares, Acquired			18,400
Treasury Stock, Shares, Acquired	[1]				19,539		7,820		5,355
Treasury Stock, Value, Acquired, Cost Method				$ (535,000)	$ 313,000	[1]	$ 132,000	[1]	$ (166,000)	[1]

[1] Were acquired during the $3 million repurchase program authorized in September 2012.