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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Cash flows from operating activities:    
Net earnings (loss) $ 2,277 $ (14)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:    
Depreciation 1,994 1,994
Bad debt provision (8) 45
Provision for deferred income tax expense (105) (167)
Increase in prepaid income taxes   (391)
Decrease in receivables 3,188 7,255
Increase in inventories (1,128) (1,296)
Increase (decrease) in accounts payable and other accrued expenses 157 (2,561)
Decrease in deferred revenue (423) (258)
Other, net (624) (298)
Net cash provided by operating activities 5,328 4,309
Cash flows from investing activities:    
Capital expenditures (1,538) (1,230)
Decrease (increase) in restricted cash 12 (96)
Net cash used in investing activities (1,526) (1,326)
Cash flows from financing activities:    
Dividends paid (784) (773)
Dividends paid to minority interest (744)  
Decrease in short-term borrowings (4,109) (187)
Payments on long-term debt (150) (150)
Payments on capital leases (36) (61)
Net proceeds from exercise of stock options (including tax benefit) 94  
Net cash used in financing activities (5,729) (1,171)
Effect of exchange rate changes on cash (59) (285)
(Decrease) increase in cash and cash equivalents (1,986) 1,527
Cash and cash equivalents, beginning of period 6,188 2,402
Cash and cash equivalents, end of period $ 4,202 $ 3,929