Condensed Consolidated Statements Of Cash Flows (USD $)	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Cash flows from operating activities:
Consolidated net income	$ 101,867	$ 216,329
Adjustments to reconcile consolidated net income to net cash provided by (used in) operating activities:
Depreciation and amortization	5,053	3,051
Unrealized (gain) loss on marketable securities, net.	(1,920)	210
Deferred income taxes.	3,000	3,000
Changes in operating assets and liabilities:
Accounts receivable.	(201,560)	(1,885,810)
Other receivables	(679)	(547)
Prepaid expenses	(9,416)	56,927
Prepaid and recoverable income taxes.	(1,210)	84,271
Accounts and other payables and accrued expenses and other current liabilities	196,222	296,228
Advances from customers	(44,062)	(58,750)
Net cash provided by (used in) operating activities.	47,295	(1,285,091)
Cash flows from investing activities:
Proceeds from maturities of certificates of deposit and marketable securities.	2,748,534	2,748,253
Purchases of certificates of deposit and marketable securities.	(1,749,532)	(3,847,739)
Purchases of equipment and leasehold improvements	(10,210)	(2,394)
Net cash provided by (used in) investing activities.	988,792	(1,101,880)
Cash flows from financing activities:
Purchases of treasury stock.	(104,076)	(25,726)
Distribution to noncontrolling interest.	(7,000)	(7,000)
Net cash used in financing activities.	(111,076)	(32,726)
Net increase (decrease) in cash and cash equivalents.	925,011	(2,419,697)
Cash and cash equivalents at beginning of period.	4,645,854	5,669,972
Cash and cash equivalents at end of period.	5,570,865	3,250,275
Supplemental disclosures of cash flow data:
Income taxes paid	$ 89,000	$ 70,000