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Federal, State and Local Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Current tax expense:    
Federal $ 1,024 $ 869
State and local 72 90
Current tax expense 1,096 959
Deferred tax expense:    
Federal (12) 106
State and local (151) 24
Deferred tax expense (163) 130
Income tax provision: $ 933 $ 1,089