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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Cash flows from operating activities:    
Net earnings $ 2,957 $ 2,867
Adjustments to reconcile net earnings to net cash (used in) provided by operating activities:    
Depreciation 1,403 1,301
Bad debt provision 45 23
Stock based compensation expense 178 98
Deferred income tax expense (benefit) 50 (44)
Change in assets and liabilities:    
Increase in receivables (3,401) (1,228)
Increase in inventories (1,504) (1,163)
Increase in accounts payable and other accrued expenses 3,514 456
(Decrease) increase in deferred revenue (4,300) 330
Other, net (1,055) (434)
Net cash (used in) provided by operating activities (2,113) 2,206
Cash flows from investing activities:    
Capital expenditures (1,437) (1,762)
Decrease (increase) in restricted cash 43 (82)
Net cash used in investing activities (1,394) (1,844)
Cash flows from financing activities:    
Dividends paid (868) (757)
Dividends paid to noncontrolling interest in subsidiaries (74)  
Proceeds from short-term borrowings 28,476 29,602
Repayments on short-term borrowings (24,356) (26,698)
Payments on long-term debt (334) (210)
Net proceeds from exercise of stock options 8 141
Net cash provided by financing activities 2,852 2,078
Effect of exchange rate changes on cash and cash equivalents (59) (83)
(Decrease) increase in cash and cash equivalents (714) 2,357
Cash and cash equivalents, beginning of period 12,506 5,222
Cash and cash equivalents, end of period $ 11,792 $ 7,579