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Organization, Use of Estimates and Basis of Presentation - Narrative (Details)
3 Months Ended
Oct. 15, 2013
Jul. 31, 2016
USD ($)
subsidiary
Jul. 31, 2015
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Number of operating subsidiaries | subsidiary   3      
Positive working capital   $ 2,000,000      
Cash and cash equivalents   4,463,000 $ 6,760,000 $ 2,585,000 $ 9,357,000
Reverse stock split conversion ratio 0.0833        
Unrecognized tax benefits   185,000   $ 165,000  
Provision for income taxes   $ 14,000 $ 6,000