Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015
Cash flows from operating activities:
Consolidated net income	$ 293,005	$ 278,893
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	10,719	11,127
Unrealized gain on marketable securities, net	(2,488)	(248)
Deferred income taxes	12,000	15,000
Changes in operating assets and liabilities:
Accounts receivable	638,001	1,169,514
Other receivables	(9,684)	(5,573)
Prepaid expenses	(166,764)	(49,003)
Prepaid and recoverable income taxes	(55,269)
Accounts and other payables and accrued expenses and other current liabilities	(433,567)	(98,056)
Income taxes payable	(14,810)	54,000
Advances from customers	(46,626)	(63,808)
Net cash provided by operating activities	224,517	1,311,846
Cash flows from investing activities:
Proceeds from maturities of marketable securities	1,012,000	996,000
Purchases of marketable securities	(995,000)	(1,282,000)
Purchases of equipment and leasehold improvements	(2,335)	(7,609)
Net cash provided by (used in) investing activities	14,665	(293,609)
Cash flows from financing activities:
Distribution to noncontrolling interest	(56,274)	(7,800)
Net cash used in financing activities	(56,274)	(7,800)
Net increase in cash and cash equivalents	182,908	1,010,437
Cash and cash equivalents at beginning of period	4,514,157	3,669,790
Cash and cash equivalents at end of period	4,697,065	4,680,227
Supplemental disclosures of cash flow data:
Income taxes paid	$ 304,000	$ 208,000