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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Cash Flows from Operating Activities      
Net earnings $ 1,800 $ 2,098 $ 3,750
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation 2,664 2,487 2,348
Bad debt provision 214 60 163
Provision for deferred income tax expense (benefit) (1,539) 223 (393)
Decrease in prepaid income taxes     9
Decrease (increase) in receivables 3,888 (1,237) (1,806)
Increase in inventories (1,294) (2,116) (511)
(Decrease) increase in accounts payable and other accrued expenses (459) (672) 977
Increase (decrease) in deferred revenue 254 522 (712)
Other, net 1,395 (94) 708
Net cash provided by operating activities 6,923 1,271 4,533
Cash Flows from Investing Activities      
Capital expenditures (1,435) (5,247) (4,239)
Increase in restricted cash (151) (9) (88)
Net cash used in investing activities (1,586) (5,256) (4,327)
Cash Flows from Financing Activities      
Dividends paid (1,031) (1,030) (976)
Dividends paid to noncontrolling interest in subsidiaries     (383)
Net increase (decrease) in short-term borrowings 228 1,716 (848)
Proceeds from long-term debt   4,000  
Payments on capital leases (83) (82) (220)
Payments on long-term debt (200) (133)  
Net proceeds from exercise of stock options (including tax benefit)   34 141
Net cash (used in) provided by financing activities (1,086) 4,505 (2,286)
Effect of exchange rate changes on cash, net (465) 160 243
Increase (decrease) in Cash and Cash Equivalents 3,786 680 (1,837)
Cash and Cash Equivalents at Beginning of Year 2,402 1,722 3,559
Cash and Cash Equivalents at End of Year 6,188 2,402 1,722
Supplemental Disclosure of Cash Flow Information      
Interest paid 444 174 157
Income taxes paid 418 1,474 1,308
Fixed assets in accounts payable     $ 555