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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Cash flows from operating activities:    
Net earnings $ 2,988 $ 2,277
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,846 1,994
Bad debt provision 109 (8)
Non-cash stock option expense 186 180
Provision (benefit) for deferred income tax expense (80) (105)
Decrease in receivables 3,805 3,188
Decrease (increase) in inventories 696 (1,128)
(Decrease) increase in accounts payable and other accrued expenses (2,127) 157
Decrease in deferred revenue (317) (423)
Other, net 126 (804)
Net cash provided by operating activities 7,232 5,328
Cash flows from investing activities:    
Capital expenditures (1,614) (1,538)
Decrease in restricted cash 14 12
Net cash used in investing activities (1,600) (1,526)
Cash flows from financing activities:    
Dividends paid (834) (784)
Dividends paid to noncontrolling interest in subsidiaries (38) (744)
Decrease in short-term borrowings and interest rate swap (2,828) (4,109)
Proceeds from long-term debt 5,000  
Payments on long-term debt (3,748) (150)
Payments on capital leases   (36)
Payment toward purchase of noncontrolling interest in subsidiary (1,780)  
Net proceeds from exercise of stock options (including tax benefit) 59 94
Net cash used in financing activities (4,169) (5,729)
Effect of exchange rate changes on cash (616) (59)
Increase (decrease) in cash and cash equivalents 847 (1,986)
Cash and cash equivalents, beginning of period 5,811 6,188
Cash and cash equivalents, end of period 6,658 4,202
Supplemental Disclosure of Cash Flow Information    
Purchase of noncontrolling interest in subsidiary - Other accrued expenses and other non-current liabilities $ 1,775