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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Cash Flows from Operating Activities      
Net earnings $ 4,620 $ 3,877 $ 3,640
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation 2,702 2,592 2,615
Bad debt provision 37 74 55
Stock based compensation expense 199 192 196
Provision (benefit) for deferred income tax expense 234 (335) (513)
Change in assets and liabilities:      
(Increase) decrease in receivables (2,091) 1,197 (5,688)
(Decrease) increase in inventories 691 (2,881) (807)
Increase in accounts payable and other accrued expenses 686 1,351 3,008
Increase in deferred revenue 5,021 569 79
Other, net (437) 635 (294)
Net cash provided by operating activities 11,662 7,271 2,291
Cash Flows from Investing Activities      
Capital expenditures (2,611) (2,187) (2,568)
Decrease (increase) in restricted cash 132 709 (1,908)
Net cash used in investing activities (2,479) (1,478) (4,476)
Cash Flows from Financing Activities      
Dividends paid (1,570) (1,361) (1,234)
Dividends paid to noncontrolling interest in subsidiaries (56) (75) (38)
(Decrease) increase in short-term borrowings and interest rate swaps, net (227) (1,137) 1,805
Payment toward purchase of noncontrolling interest in subsidiary   (888) (888)
Payments on long-term debt (421) (422) (421)
Net proceeds from exercise of stock options (including tax benefit) 190 479 33
Net cash used in financing activities (2,084) (3,404) (743)
Effect of exchange rate changes on cash, net 185 (211) (276)
Increase (Decrease) in Cash and Cash Equivalents 7,284 2,178 (3,204)
Cash and Cash Equivalents at Beginning of Year 5,222 3,044 6,248
Cash and Cash Equivalents at End of Year 12,506 5,222 3,044
Supplemental Disclosure of Cash Flow Information      
Interest paid 292 306 323
Income taxes paid $ 2,618 $ 2,387 $ 1,873