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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Cash flows from operating activities:    
Net income $ 2,209 $ 2,120
Non-cash charges to earnings and non-operating income or loss, net 2,611 2,973
Net changes in operating assets and liabilities (5,801) (4,681)
Net cash (used in) provided by operating activities (981) 412
Cash flows from investing activities:    
Proceeds on redemption of marketable securities and sale of assets 2,006 5,111
Purchase of marketable securities (947) (8,222)
Loan to related party   (92)
Purchase of fixed assets (612) (855)
Net cash provided by (used in) investing activities 447 (4,058)
Cash flows from financing activities:    
Proceeds from exercise of stock options 20 13
Proceeds from credit line borrowings 4,000  
Payment of short-term credit and lease obligations (1,731) (138)
Net cash provided by (used in) financing activities 2,289 (125)
Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes 1,755 (3,771)
Effect of exchange rate changes on cash and cash equivalents 441 140
Net increase (decrease) in cash and cash equivalents 2,196 (3,631)
Cash and cash equivalents at beginning of period 4,782 5,275
Cash and cash equivalents at end of period 6,978 1,644
Cash paid during the period for:    
Interest 94 46
Income Taxes $ 1,275 $ 828