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RESTRICTED STOCK AGREEMENTS (Details)
3 Months Ended 12 Months Ended
Jun. 17, 2013
USD ($)
employee
$ / shares
shares
Jan. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
$ / shares
shares
Apr. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award        
Restricted Stock Forfeiture Recovery | $   $ 88,000    
Stock compensation cost amortized (credited) | $     $ (65,000) $ 35,000
Restricted Shares Under Option        
Outstanding at beginning of period     350,000 350,000
Outstanding at end of period     350,000 350,000
Weighted Average Grant Price        
Outstanding at beginning of period, Weighted Average Grant Price (in dollars per share) | $ / shares     $ 0.500 $ 0.500
Outstanding at end of period, Weighted Average Grant Price (in dollars per share) | $ / shares     $ 0.500 $ 0.500
Stock Appreciation Plan | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Restriction period of awards     5 years  
Minimum cumulative annual growth in EBIT necessary for lapsing of     10.00%  
Minimum average return on capital employed necessary for lapsing of     25.00%  
Stock Appreciation Plan | Restricted Stock | Three Key Employees        
Share-based Compensation Arrangement by Share-based Payment Award        
Aggregate amount of restricted stock awards authorized 400,000      
Share Price | $ / shares $ 0.50      
Fair Value on Grant Date | $ $ 200,000      
Stock Award Plan | Restricted Stock        
Restricted Shares Under Option        
Outstanding at end of period 350,000      
Stock Award Plan | Restricted Stock | Three Key Employees        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of key employees receiving award under plan | employee 3