CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	May 31, 2016	May 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 1,888,925	$ 1,088,307
Accounts receivable, less allowance for doubtful accounts of $8,405 and $17,468, respectively	969,474	1,111,570
Inventories, net	1,863,091	2,027,372
Prepaid expenses and other	113,578	164,352
Total current assets	4,835,068	4,391,601
PROPERTY AND EQUIPMENT
Equipment	1,496,119	1,442,856
Furniture, fixtures and leasehold improvements	308,440	270,147
Total property and equipment	1,804,559	1,713,003
Accumulated depreciation	(1,423,900)	(1,267,617)
Net property and equipment	380,659	445,386
DEFERRED TAX ASSETS	41,000	744,000
INTANGIBLE ASSETS, net	248,801	321,304
INVESTMENTS	165,324	165,324
OTHER ASSETS	55,653	56,838
TOTAL ASSETS	5,726,505	6,124,453
CURRENT LIABILITIES
Accounts payable and accrued expenses	333,485	392,139
Accrued compensation	172,542	131,794
Total current liabilities	506,027	523,933
COMMITMENTS AND CONTINGENCIES (NOTE 9)
SHAREHOLDERS' EQUITY
Preferred stock, no par value, 5,000,000 authorized shares, no shares issued and outstanding at May 31, 2016 and 2015
Common stock, $.08 par value; 25,000,000 shares authorized; 8,169,673 and 7,566,714 shares issued and outstanding, respectively	653,573	605,336
Additional paid-in capital	19,399,720	18,326,890
Accumulated other comprehensive loss	(13,586)	(12,264)
Accumulated deficit	(14,819,229)	(13,319,442)
Total shareholders' equity	5,220,478	5,600,520
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,726,505	$ 6,124,453