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Note 8 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Current tax expense:    
Federal $ 734 $ 1,319
State and local 88 79
Current tax expense 822 1,398
Deferred tax expense (benefit):    
Federal (186)
State and local (271) (30)
Deferred tax expense (benefit): (271) (216)
Income tax provision $ 551 $ 1,182