Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Cash flows from operating activities:
Consolidated net income	$ 270,215	$ 153,780
Adjustments to reconcile consolidated net income to net cash provided by (used in) operating activities:
Depreciation and amortization	16,919	13,225
Unrealized loss (gain) on marketable securities, net	3,896	(4,744)
Deferred income taxes	24,000	62,000
Changes in operating assets and liabilities:
Accounts receivable	203,357	(567,252)
Other receivables	(7,062)	6,235
Prepaid expenses	(23,373)	(67,099)
Prepaid and recoverable income taxes	(4,562)	10,536
Accounts and other payables and accrued expenses and other current liabilities	(7,281)	$ 154,066
Income taxes payable	(3,877)
Advances from customers	(147,894)	$ (48,061)
Net cash provided by (used in) operating activities	324,338	(287,314)
Cash flows from investing activities:
Proceeds from maturities of marketable securities	1,493,000	2,238,000
Purchases of marketable securities	(1,778,000)	(2,238,000)
Purchases of equipment and leasehold improvements	(8,857)	(13,839)
Net cash used in investing activities	(293,857)	(13,839)
Cash flows from financing activities:
Distribution to noncontrolling interest	(87,641)	(100,491)
Net cash used in financing activities	(87,641)	(100,491)
Net decrease in cash and cash equivalents	(57,160)	(401,644)
Cash and cash equivalents at beginning of period	3,669,790	2,841,967
Cash and cash equivalents at end of period	3,612,630	2,440,323
Supplemental disclosures of cash flow data:
Income taxes paid	$ 254,000	$ 33,000