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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Cash flows from operating activities:    
Net earnings $ 1,330 $ 963
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:    
Depreciation 647 621
Bad debt provision 15  
Stock based compensation expense 47 47
Benefit for deferred income tax expense (39) (10)
Change in assets and liabilities:    
(Increase) decrease in receivables (2,697) 989
Increase in inventories (1,159) (1,225)
Increase in accounts payable and other accrued expenses 1,995 449
Increase in deferred revenue 26 386
Other, net (345) (699)
Net cash (used in) provided by operating activities (180) 1,521
Cash flows from investing activities:    
Capital expenditures (1,056) (472)
(Increase) decrease in restricted cash (59) 312
Net cash used in investing activities (1,115) (160)
Cash flows from financing activities:    
Dividends paid (350) (316)
Dividends paid to noncontrolling interest in subsidiaries   (75)
Increase (decrease) in short-term borrowings and interest rate swaps 3,140 (54)
Payments on long-term debt (105) (106)
Payment toward purchase of noncontrolling interest in subsidiary   (888)
Net proceeds from exercise of stock options (including tax benefit) 103  
Net cash provided by (used in) financing activities 2,788 (1,439)
Effect of exchange rate changes on cash (4) (67)
Increase (decrease) in cash and cash equivalents 1,489 (145)
Cash and cash equivalents, beginning of period 5,222 3,044
Cash and cash equivalents, end of period $ 6,711 $ 2,899