Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014
Cash flows from operating activities:
Consolidated net income	$ 278,893	$ 214,270
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	11,127	9,485
Unrealized gain on marketable securities, net	(248)	(7,944)
Deferred income taxes	15,000	121,000
Changes in operating assets and liabilities:
Accounts receivable	1,169,514	282,927
Other receivables	(5,573)	7,656
Prepaid expenses	$ (49,003)	(68,690)
Prepaid and recoverable income taxes		802
Accounts and other payables and accrued expenses and other current liabilities	$ (98,056)	$ 223,644
Income taxes payable	54,000
Advances from customers	(63,808)	$ (101,559)
Net cash provided by operating activities	1,311,846	681,591
Cash flows from investing activities:
Proceeds from maturities of marketable securities	996,000	1,493,000
Purchases of marketable securities	(1,282,000)	(994,000)
Purchases of equipment and leasehold improvements	(7,609)	(9,337)
Net cash provided by (used in) investing activities	(293,609)	489,663
Cash flows from financing activities:
Distribution to noncontrolling interest	(7,800)	(3,794)
Net cash used in financing activities	(7,800)	(3,794)
Net increase in cash and cash equivalents	1,010,437	1,167,460
Cash and cash equivalents at beginning of period	3,669,790	2,841,967
Cash and cash equivalents at end of period	4,680,227	4,009,427
Supplemental disclosures of cash flow data:
Income taxes paid	$ 208,000	$ 22,000