CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Cash flows from operating activities:
Net loss	$ (274,105)	$ (574,483)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	174,554	192,670
Stock option expense	25,869	6,063
Change in provision for losses on accounts receivable	$ (9,012)	(12,993)
Gain on disposal of property and equipment		(665)
Inventory reserve	$ 12,220	7,328
Decrease in deferred rent liability	(20,573)	$ (14,834)
Increase in deferred tax assets	(254,000)
Changes in assets and liabilities:
Accounts receivable	200,638	$ 529,304
Inventories	(84,949)	(352,354)
Prepaid expenses and other assets	62,269	(26,521)
Accounts payable and accrued expenses	(44,559)	(73,902)
Other assets	(11,448)	(14,788)
Accrued compensation	28,040	16,262
Net cash used in operating activities	$ (195,056)	(318,913)
Cash flows from investing activities:
Proceeds from sale of equipment		1,900
Increases in intangibles	$ (925)	(14,135)
Purchases of property and equipment	(69,998)	(8,656)
Net cash used in investing activities	(70,923)	(20,891)
Cash flows from financing activities:
Proceeds from exercise of stock options	38,256	4,355
Net cash provided by financing activities	38,256	4,355
Effect of exchange rate changes in cash	(1,439)	(1,987)
Net decrease in cash and cash equivalents	(229,162)	(337,436)
Cash and cash equivalents at beginning of period	1,088,307	1,509,125
Cash and cash equivalents at end of period	859,145	1,171,689
Cash paid during the period for:
Interest	124	17
Income taxes	$ 800	$ 800