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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Cash flows from operating activities:    
Net earnings $ 2,867 $ 1,670
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,301 1,227
Bad debt provision 23 24
Stock based compensation expense 98 96
Benefit for deferred income tax expense (44) (20)
Change in assets and liabilities:    
(Increase) decrease in receivables (1,228) 510
(Increase) in inventories (1,163) (995)
Increase (decrease) in accounts payable and other accrued expenses 456 (817)
Increase in deferred revenue 330 477
Other, net (434) (311)
Net cash provided by operating activities 2,206 1,861
Cash flows from investing activities:    
Capital expenditures (1,762) (1,261)
(Increase) decrease in restricted cash (82) 597
Net cash used in investing activities (1,844) (664)
Cash flows from financing activities:    
Dividends paid (757) (664)
Dividends paid to noncontrolling interest in subsidiaries   (75)
Increase in short-term borrowings and interest rate swaps 2,904 574
Payments on long-term debt (210) (211)
Payment toward purchase of noncontrolling interest in subsidiary   (888)
Net proceeds from exercise of stock options (including tax benefit) 141 458
Net cash provided by (used in) financing activities 2,078 (806)
Effect of exchange rate changes on cash (83) (161)
Increase in cash and cash equivalents 2,357 230
Cash and cash equivalents, beginning of period 5,222 3,044
Cash and cash equivalents, end of period $ 7,579 $ 3,274