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Note 15 -Business Segments (Details Textual)
 3 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
 [1]
Jan. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
 [2]
Jan. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Jul. 31, 2014
USD ($)
Apr. 30, 2014
USD ($)
Jan. 31, 2014
USD ($)
Oct. 31, 2013
USD ($)
Jul. 31, 2013
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2014
USD ($)
Number of Reportable Segments                         2    
Operating Income (Loss) $ (462,000) $ 557,000 $ 826,000 $ 959,000 $ (560,000) $ 851,000 $ 1,046,000 $ 1,062,000 $ 378,000 $ 1,008,000 $ 646,000 $ 469,000 $ 1,880,000 $ 2,399,000 $ 2,501,000
Accelerated Write Off of Obsolete Software                           $ 138,000  
[1] During the fourth quarter ended April 30, 2016, the Company's loss from operations of $462,000 was the result of accelerated amortization related to the cessation of software development for certain data galleries.
[2] During the fourth quarter ended April 30, 2015, the Company's loss from operations of $560,000 was the result of 12 weeks of print revenues recorded in the fourth quarter of fiscal 2015 as compared to 13 weeks recorded in the fourth quarter of fiscal 2014, accelerated write-off of $138,000 related to obsolete software and an additional direct mail campaign in the fourth quarter of fiscal 2015.