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Note F - Debt Facilities (Tables)
6 Months Ended
Oct. 31, 2016
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
(In thousands)            
    Aggregate   Interest       Balance at
    Amount   Rate   Maturity   October 31, 2016   April 30, 2016
                                     
Revolving credit facilities   $ 172,500     LIBOR + 2.375%     October 8, 2017     $ 124,488     $ 107,386  
            (2.91% at October 31, 2016 and 2.81% at April 30, 2016)