CONSOLIDATED BALANCE SHEETS - USD ($)	May 31, 2017	May 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 1,225,462	$ 1,888,925
Accounts receivable, less allowance for doubtful accounts of $50,129 and $8,405, respectively	1,060,011	969,474
Inventories, net	1,729,121	1,863,091
Prepaid expenses and other	195,757	113,578
Total current assets	4,210,351	4,835,068
PROPERTY AND EQUIPMENT:
Equipment	1,549,411	1,496,119
Furniture, fixtures and leasehold improvements	332,519	308,440
Total property and equipment	1,881,930	1,804,559
Accumulated depreciation	(1,550,073)	(1,423,900)
Net property and equipment	331,857	380,659
DEFERRED TAX ASSETS	41,000	41,000
INTANGIBLE ASSETS, net	174,469	248,801
INVESTMENTS	165,324	165,324
OTHER ASSETS	94,989	55,653
TOTAL ASSETS	5,017,990	5,726,505
CURRENT LIABILITIES:
Accounts payable and accrued expenses	352,000	333,485
Accrued compensation	176,866	172,542
Total current liabilities	528,866	506,027
COMMITMENTS AND CONTINGENCIES (NOTE 8)
SHAREHOLDERS' EQUITY
Preferred stock, no par value, 5,000,000 authorized shares, no shares issued and outstanding at May 31, 2017 and 2016
Common stock, $.08 par value; 25,000,000 shares authorized; 8,511,173 and 8,169,673 shares issued and outstanding at May 31, 2017 and 2016, respectively	680,893	653,573
Additional paid-in capital	19,551,855	19,399,720
Accumulated other comprehensive loss	(15,834)	(13,586)
Accumulated deficit	(15,727,790)	(14,819,229)
Total shareholders' equity	4,489,124	5,220,478
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,017,990	$ 5,726,505