Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Cash flows from operating activities:
Consolidated net income	$ 155,919	$ 145,067
Adjustments to reconcile consolidated net income to net cash provided by (used in) operating activities:
Depreciation and amortization	5,359	5,539
Unrealized (gain) loss from marketable securities, net	(3,440)	4,736
Deferred income taxes.	6,000	5,000
Changes in operating assets and liabilities:
Accounts receivable	(116,476)	(450,826)
Other receivables	(3,263)	(2,504)
Prepaid expenses	(78,608)	10,180
Accounts and other payables and accrued expenses and other current liabilities	(16,483)	170,785
Income taxes payable	60,921	110,500
Advances from customers	18,290	(77,007)
Net cash provided by (used in) operating activities	28,219	(78,530)
Cash flows from investing activities:
Proceeds from maturities of marketable securities	248,000	498,000
Purchases of marketable securities	(249,000)	(498,000)
Purchases of equipment and leasehold improvements		(5,822)
Net cash used in investing activities	(1,000)	(5,822)
Cash flows from financing activities:
Distributions to noncontrolling interest	(4,650)
Net cash used in financing activities	(4,650)
Net increase (decrease) in cash and cash equivalents.	22,569	(84,352)
Cash and cash equivalents at beginning of period	4,514,157	3,669,790
Cash and cash equivalents at end of period	4,536,726	3,585,438
Supplemental disclosures of cash flow data:
Income taxes paid	$ 69,000	$ 25,000