Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities:
Net income	$ 3,729	$ 3,194
Non-cash charges to earnings, net	3,843	4,886
Net changes in operating assets and liabilities	(4,347)	(6,804)
Net cash provided by operating activities	3,225	1,276
Cash flows from investing activities:
Proceeds from sale of marketable securities	2,509	6,111
Purchase of marketable securities	(1,004)	(8,757)
Loan to affiliate		(92)
Purchase of fixed assets	(1,608)	(1,124)
Net cash used in investing activities	(103)	(3,862)
Cash flows from financing activities:
Proceeds from short-term credit obligations	4,000	2,350
Debt payments	(5,311)	(203)
Payment of cash dividend	(1,684)
Exercise of stock options	20	13
Net cash (used in) provided by financing activities	(2,975)	2,160
Net increase (decrease) in cash and cash equivalents
before effect of exchange rate changes	147	(426)
Effect of exchange rate changes
on cash and cash equivalents	293	(301)
Net increase (decrease) in cash and cash equivalents	440	(727)
Cash and cash equivalents at beginning of period	4,782	5,275
Cash and cash equivalents at end of period	5,222	4,548
Supplemental disclosures of cash flow information:
Interest	147	72
Income Taxes	$ 1,889	$ 1,128