Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Cash flows from operating activities:
Consolidated net income (loss)	$ 26,188	$ (509,579)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	12,693	8,931
Unrealized (gain) loss on marketable securities, net	(384)	3,968
Deferred income taxes	15,000	3,000
Changes in operating assets and liabilities:
Accounts receivable	345,802	685,717
Other receivables	632	(5,170)
Prepaid expenses	(17,907)	5,495
Prepaid and recoverable income taxes	100,420	(233,956)
Accounts and other payables and accrued expenses and other current liabilities	(132,319)	(377,029)
Advances from customers	(11,202)	(19,800)
Net cash provided by (used in) operating activities	338,923	(438,423)
Cash flows from investing activities:
Proceeds from maturities of marketable securities	2,486,000	2,495,267
Purchases of marketable securities	(1,990,000)	(3,984,267)
Purchases of equipment and leasehold improvements	(31,738)	(6,304)
Net cash provided by (used in) investing activities	464,262	(1,495,304)
Cash flows from financing activities:
Cash dividend paid		(2,970,093)
Purchases of treasury stock		(81,911)
Distribution to noncontrolling interest	(26,147)	(45,569)
Net cash used in financing activities	(26,147)	(3,097,573)
Net increase (decrease) in cash and cash equivalents	777,038	(5,031,300)
Cash and cash equivalents at beginning of period	1,881,161	7,514,749
Cash and cash equivalents at end of period	2,658,199	2,483,449
Supplemental disclosures of cash flow data:
Income taxes paid	$ 21,000	$ 12,000