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SHARE BASED COMPENSATION (Details)
12 Months Ended
Apr. 30, 2015
USD ($)
PerformanceObjective
$ / shares
shares
Apr. 30, 2014
USD ($)
$ / shares
shares
Apr. 30, 2013
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 2,215,000 $ 1,162,000 $ 45,000
Restricted Stock [Member]      
Restricted share awards, shares [Roll Forward]      
Unvested, beginning of period (in shares) | shares 104,855 0  
Granted (in shares) | shares 107,536 104,855  
Vested during year (in shares) | shares (79,181)    
Forfeited (in shares) | shares (25,674)    
Unvested, end of period (in shares) | shares 107,536 104,855 0
Weighted avg grant-date fair value [Abstract]      
Unvested, beginning of period (in dollars per share) | $ / shares $ 8.72 $ 0  
Granted (in dollars per share) | $ / shares 7.17 8.72  
Vested during period (in dollars per share) | $ / shares 8.72    
Forfeited (in dollars per share) | $ / shares 8.72    
Unvested, end of period (in dollars per share) | $ / shares $ 7.17 $ 8.72 $ 0
2008 Incentive Award Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares (in shares) | shares 2,000,000    
Term of award (in years) 10 years    
Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Incentive plan award description Three-Year Average Annual Total Shareholder Return    
Dividend yield (in hundredths) 6.10%    
Long Term Incentive Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility rate (in hundredths) 15.00%    
Risk-free interest rate (in hundredths) 0.03%    
Officers' total award opportunity under the LTIP stated as a percentage of base salary (in hundredths) 50.00%    
Calculated grant date fair value as a percentage of base salary for officers (in hundredths) 47.00%    
Long Term Incentive Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility rate (in hundredths) 20.00%    
Risk-free interest rate (in hundredths) 0.09%    
Officers' total award opportunity under the LTIP stated as a percentage of base salary (in hundredths) 100.00%    
Calculated grant date fair value as a percentage of base salary for officers (in hundredths) 94.00%    
Long Term Incentive Plan [Member] | Unrestricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of awards payable (in hundredths) 50.00%    
Performance period (in years) 1 year    
Restricted shares vesting period 1 year    
Long Term Incentive Plan [Member] | Unrestricted Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of performance objectives to meet | PerformanceObjective 1    
Long Term Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of awards payable (in hundredths) 50.00%    
Performance period (in years) 2 years    
Long Term Incentive Plan [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense     $ 0
Long Term Incentive Plan [Member] | Performance Shares [Member] | 2015 Performance Period [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 1,300,000    
Long Term Incentive Plan [Member] | Performance Shares [Member] | 2014 Performance Period [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 690,000 $ 914,000  
Trustee Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 39,139 28,976 15,975
Restricted Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of share grants vested 568,000 $ 0 $ 0
Total compensation cost related to non-vested share awards $ 771,000