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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Cash flows from operating activities:    
Net earnings $ 3,225 $ 2,518
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,960 1,850
Bad debt provision (42) 7
Stock based compensation expense 150 146
(Expense) benefit for deferred income tax expense (12) 40
Change in assets and liabilities:    
Decrease (increase) in receivables 2,090 (310)
(Increase) in inventories (105) (3,409)
(Decrease) increase in accounts payable and other accrued expenses (1,189) 1,663
(Decrease) increase in deferred revenue (237) 467
Other, net 11 164
Net cash provided by operating activities 5,851 3,136
Cash flows from investing activities:    
Capital expenditures (2,190) (1,708)
Decrease in restricted cash 129 832
Net cash used in investing activities (2,061) (876)
Cash flows from financing activities:    
Dividends paid (1,163) (1,012)
Dividends paid to noncontrolling interest in subsidiaries   (75)
Increase in short-term borrowings and interest rate swaps 861 583
Payments on long-term debt (316) (316)
Payment toward purchase of noncontrolling interest in subsidiary   (888)
Net proceeds from exercise of stock options (including tax benefit) 141 459
Net cash used in financing activities (477) (1,249)
Effect of exchange rate changes on cash (281) (346)
Increase in cash and cash equivalents 3,032 665
Cash and cash equivalents, beginning of period 5,222 3,044
Cash and cash equivalents, end of period $ 8,254 $ 3,709