Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Cash flows from operating activities:
Net income	$ 768	$ 1,344
Non-cash charges to earnings, net	1,250	1,052
Net changes in operating assets and liabilities	(2,420)	266
Net cash (used in) provided by operating activities	(402)	2,662
Cash flows from investing activities:
Purchase of marketable securities	(717)	(4,324)
Proceeds on redemption of marketable securities	2,000	4,511
Purchase of fixed assets	(332)	(520)
Net cash provided by (used in) investing activities	951	(333)
Cash flows from financing activities:
Proceeds from exercise of stock options	20	13
Payment of lease obligations	(107)	(66)
Net cash used in financing activities	(87)	(53)
Net increase in cash and cash equivalents before effect of exchange rate changes	462	2,276
Effect of exchange rate changes on cash and cash equivalents	217	108
Net increase in cash and cash equivalents	679	2,384
Cash and cash equivalents at beginning of period	4,782	5,275
Cash and cash equivalents at end of period	5,461	7,659
Cash paid during the period for:
Interest	46	24
Income Taxes	$ 150	$ 1