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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Cash Flows from Operating Activities:    
Net earnings $ 688 $ 108
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:    
Depreciation 658 677
Bad debt provision 25 6
Provision for deferred income tax expense (37) (62)
Decrease in receivables 677 58
Decrease in inventories 43 205
Increase (decrease) in accounts payable and other accrued expenses 768 (1,315)
Increase in deferred revenue 140 343
Other, net (232) (907)
Net cash provided by (used in) operating activities 2,730 (887)
Cash Flows from Investing Activities:    
Capital expenditures (434) (304)
Decrease (Increase) in restricted cash 51 (355)
Net cash used in investing activities (383) (659)
Cash Flows from Financing Activities:    
Dividends paid (258) (258)
(Decrease) increase in short-term borrowings (315) 2,084
Payments on long-term debt (50) (50)
Payments on capital leases (21) (20)
Net proceeds from exercise of stock options (including tax benefit) 32  
Net cash (used in) provided by financing activities (612) 1,756
Effect of exchange rate changes on cash (203) 40
Increase in Cash and Cash Equivalents 1,532 250
Cash and Cash Equivalents, beginning of Period 6,188 2,402
Cash and Cash Equivalents, end of Period $ 7,720 $ 2,652