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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Cash Flows from Operating Activities      
Net earnings $ 3,877 $ 3,640 $ 4,003
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation 2,592 2,615 2,549
Bad debt provision 74 55 116
Stock based compensation expense 192 196 238
Provision (benefit) for deferred income tax expense (335) (513) 864
Change in assets and liabilities:      
Decrease (increase) in receivables 1,197 (5,688) 2,295
(Increase) decrease in inventories (2,881) (807) 1,265
Increase (decrease) in accounts payable and other accrued expenses 1,351 3,008 (2,862)
Increase (decrease) in deferred revenue 569 79 (351)
Other, net 635 (294) (48)
Net cash provided by operating activities 7,271 2,291 8,069
Cash Flows from Investing Activities      
Capital expenditures (2,187) (2,568) (2,021)
Decrease (increase) in restricted cash 709 (1,908) 323
Net cash used in investing activities (1,478) (4,476) (1,698)
Cash Flows from Financing Activities      
Dividends paid (1,361) (1,234) (1,122)
Dividends paid to noncontrolling interest in subsidiaries (75) (38) (38)
(Decrease) increase in short-term borrowings and interest rate swaps (1,137) 1,805 (3,847)
Proceeds from long-term debt     5,000
Payment toward purchase of noncontrolling interest in subsidiary (888) (888) (1,780)
Payments on long-term debt (422) (421) (3,854)
Net proceeds from exercise of stock options (including tax benefit) 479 33 92
Net cash used in financing activities (3,404) (743) (5,549)
Effect of exchange rate changes on cash, net (211) (276) (385)
Increase (Decrease) in Cash and Cash Equivalents 2,178 (3,204) 437
Cash and Cash Equivalents at Beginning of Year 3,044 6,248 5,811
Cash and Cash Equivalents at End of Year 5,222 3,044 6,248
Supplemental Disclosure of Cash Flow Information      
Interest paid 306 323 413
Income taxes paid $ 2,387 $ 1,873 2,585
Purchase of noncontrolling interest in subsidiary - Other accrued expenses and other non-current liabilities     $ 1,775