Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Cash flows from operating activities:
Consolidated net income (loss)	$ 2,923	$ (659,342)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation and amortization	2,396	1,497
Unrealized (gain) loss on marketable securities, net	9,584	(2,696)
Deferred income taxes	(3,000)	(269,000)
Non-cash lease expense	250	1,652
Changes in operating assets and liabilities:
Accounts receivable	459,430	95,091
Other receivables	(2,210)	(1,256)
Prepaid expenses	22,955	54,724
Prepaid and recoverable income taxes	(7,158)	23,945
Accounts payable, other payables, accrued expenses and other current liabilities	1,033,878	(353,361)
Advances from customers	(11,401)	(20,724)
Legal settlement payable	9,822
Net cash provided by (used in) operating activities	1,517,469	(1,129,470)
Cash flows from investing activities:
Proceeds from maturities of marketable securities		247,000
Purchases of equipment and leasehold improvements	(7,976)
Net cash (used in) provided by investing activities	(7,976)	247,000
Cash flows from financing activities:
Net drawings on line of credit	(437,153)
Net cash used in financing activities	(437,153)
Net increase (decrease) in cash and cash equivalents	1,072,340	(882,470)
Cash and cash equivalents at beginning of period	9,730,022	3,694,989
Cash and cash equivalents at end of period	10,802,362	2,812,519
Supplemental disclosures of cash flow data:
Income taxes paid	$ 6,000	$ 17,000