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Treasury Stock and Repurchase Program - Components of treasury stock, at cost (Parentheticals) (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jul. 31, 2015
Jun. 30, 2015
May. 31, 2015
Jan. 31, 2012
Jan. 31, 2011
Jul. 31, 2015
Jul. 31, 2014
Sep. 19, 2012
Equity, Class of Treasury Stock [Line Items]                
Number of treasury shares [1] 6,002 1,246 4,989          
Total average cost $ 80,000 [1] $ 16,000 [1] $ 70,000 [1]     $ 166,000 $ 42,000  
September 2012 Share Repurchase Program                
Equity, Class of Treasury Stock [Line Items]                
Authorized repurchase amount of common stock               $ 3,000,000
January 2011 Share Repurchase Program                
Equity, Class of Treasury Stock [Line Items]                
Number of treasury shares         18,400      
Former Repurchase Program                
Equity, Class of Treasury Stock [Line Items]                
Number of treasury shares       85,219        
Total average cost       $ 1,036,000        
[1] Were acquired during the $3 million repurchase program authorized in September 2012.