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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Cash flows from operating activities:    
Net income $ 2,067 $ 2,209
Non-cash charges to earnings 2,800 2,611
Gain on sale of equipment (736) 0
Net changes in operating assets and liabilities (6,634) (5,801)
Net cash used in operating activities (2,503) (981)
Cash flows from investing activities:    
Proceeds on redemption of marketable securities 1,767 2,006
Purchase of marketable securities (67) (947)
Purchase of fixed assets and other assets (2,786) (612)
Net cash (used in) provided by investing activities (1,086) 447
Cash flows from financing activities:    
Proceeds from credit line borrowings 4,100 4,000
Payment of short-term credit obligations 0 (1,500)
Tax benefit from exercise of stock-based compensation 157 0
Proceeds from exercise of stock options 0 20
Payment of lease obligations (15) (231)
Net cash provided by financing activities 4,242 2,289
Net increase in cash and cash equivalents before effect of exchange rate changes 653 1,755
Effect of exchange rate changes on cash and cash equivalents 949 441
Net increase in cash and cash equivalents 1,602 2,196
Cash and cash equivalents at beginning of period 3,460 4,782
Cash and cash equivalents at end of period 5,062 6,978
Cash paid during the period for:    
Interest 87 94
Income Taxes $ 1,260 $ 1,275