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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Cash flows from operating activities:    
Net earnings $ 2,518 $ 3,006
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,850 1,900
Bad debt provision 7 34
Stock based compensation expense 146 154
Provision for deferred income tax expense 40 (71)
Change in assets and liabilities:    
Increase in receivables (310) (1,623)
Increase in inventories (3,409) (492)
Increase in accounts payable and other accrued expenses 1,663 4,022
Increase in deferred revenue 467 159
Other, net 164 (750)
Net cash provided by operating activities 3,136 6,339
Cash flows from investing activities:    
Capital expenditures (1,708) (2,135)
Decrease (increase) in restricted cash 832 (2,156)
Net cash used in investing activities (876) (4,291)
Cash flows from financing activities:    
Dividends paid (1,012) (919)
Dividends paid to noncontrolling interest in subsidiaries (75) (38)
Increase (decrease) in short-term borrowings and interest rate swaps 583 (2,114)
Payments on long-term debt (316) (316)
Payment toward purchase of noncontrolling interest in subsidiary (888) (888)
Net proceeds from exercise of stock options (including tax benefit) 459 33
Net cash used in financing activities (1,249) (4,242)
Effect of exchange rate changes on cash (346) (191)
Increase (decrease) in cash and cash equivalents 665 (2,385)
Cash and cash equivalents, beginning of period 3,044 6,248
Cash and cash equivalents, end of period $ 3,709 $ 3,863