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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Cash flows from operating activities:    
Net earnings $ 2,488 $ 2,363
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,263 1,248
Bad debt provision 4 71
Stock based compensation expense 108 125
Provision for deferred income tax expense (41) (42)
Change in assets and liabilities:    
(Increase) decrease in receivables (605) 5,363
(Increase) decrease in inventories (261) 29
Increase (decrease) in accounts payable and other accrued expenses 3,931 (2,198)
Increase (decrease) in deferred revenue 101 (420)
Other, net (226) (343)
Net cash provided by operating activities 6,762 6,196
Cash flows from investing activities:    
Capital expenditures (1,626) (1,188)
(Increase) decrease in restricted cash (2,501) 88
Net cash used in investing activities (4,127) (1,100)
Cash flows from financing activities:    
Dividends paid (603) (547)
Dividends paid to noncontrolling interest in subsidiaries (38) (38)
Decrease in short-term borrowings and interest rate swap (2,209) (4,278)
Proceeds from long-term debt   5,000
Payments on long-term debt (210) (3,643)
Payment toward purchase of noncontrolling interest in subsidiary (888) (1,780)
Net proceeds from exercise of stock options (including tax benefit) 32 59
Net cash used in financing activities (3,916) (5,227)
Effect of exchange rate changes on cash (104) (396)
Decrease in cash and cash equivalents (1,385) (527)
Cash and cash equivalents, beginning of period 6,248 5,811
Cash and cash equivalents, end of period 4,863 5,284
Supplemental Disclosure of Cash Flow Information    
Purchase of noncontrolling interest in subsidiary - Other accrued expenses and other non-current liabilities   $ 1,775