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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Cash flows from operating activities:    
Net earnings $ 2,363 $ 1,495
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,248 1,317
Bad debt provision 71 23
Non-cash stock option expense 125 121
Provision for deferred income tax expense (42) (96)
Decrease (increase) in receivables 5,363 (1,337)
Decrease (increase) in inventories 29 (664)
(Decrease) increase in accounts payable and other accrued expenses (2,198) 3,348
Decrease in deferred revenue (420) (607)
Other, net (343) (1,346)
Net cash provided by operating activities 6,196 2,254
Cash flows from investing activities:    
Capital expenditures (1,188) (729)
Decrease in restricted cash 88 65
Net cash used in investing activities (1,100) (664)
Cash flows from financing activities:    
Dividends paid (547) (517)
Dividends paid to noncontrolling interest in subsidiaries (38) (139)
Decrease in short-term borrowings and interest rate swap (4,278) (1,122)
Proceeds from long-term debt 5,000  
Payments on long-term debt (3,643) (100)
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 67
Net cash used in financing activities (5,227) (1,847)
Effect of exchange rate changes on cash (396) (53)
Decrease in cash and cash equivalents (527) (310)
Cash and cash equivalents, beginning of period 5,811 6,188
Cash and cash equivalents, end of period 5,284 5,878
Supplemental Disclosure of Cash Flow Information    
Purchase of noncontrolling interest in subsidiary - Other accrued expenses and other non-current liabilities $ 1,775