CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015
Cash flows from operating activities:
Net loss	$ (258,600)	$ (139,103)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	110,994	116,396
Stock option expense	1,237	2,562
Change in provision for allowance for doubtful accounts	21,921	(8,653)
Inventory reserve	(9,842)	4,216
Decrease in deferred rent liability	(3,604)	(13,072)
Increase in deferred tax assets		(129,000)
Changes in assets and liabilities:
Accounts receivable	(193,134)	(52,362)
Inventories	(8,188)	(214,238)
Prepaid expenses and other assets	(32,768)	49,986
Accounts payable and other accrued expenses	41,174	(63,233)
Accrued compensation	22,919	21,459
Net cash used in operating activities	(307,891)	(425,042)
Cash flows from investing activities:
Purchases of property and equipment	(25,682)	(28,294)
Increase in intangibles		(925)
Net cash used in investing activities	(25,682)	(29,219)
Cash flows from financing activities:
Proceeds from exercise of stock options	56,556	10,298
Net cash provided by financing activities	56,556	10,298
Effect of exchange rate changes on cash	(760)	(1,366)
Net decrease in cash and cash equivalents	(277,777)	(445,329)
Cash and cash equivalents at beginning of period	1,888,925	1,088,307
Cash and cash equivalents at end of period	1,611,148	642,978
Cash paid during the period for:
Interest	180	54
Income taxes	$ 0	$ 0