CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Aug. 31, 2018	May 31, 2018
Current Assets:
Cash and cash equivalents	$ 583,693	$ 1,204,903
Accounts receivable, less allowance for doubtful accounts of $63,392 and $57,695 as of August 31, 2018 and May 31, 2018,respectively	1,013,687	799,940
Inventories	2,208,457	2,178,777
Prepaid expenses and other	311,291	300,409
Total Current Assets	4,117,128	4,484,029
Property and Equipment, net of accumulated depreciation and amortization of $1,688,423 and $1,661,128	361,935	351,149
Deferred Tax Assets	10,000	10,000
Investments	165,324	165,324
Intangible Assets, net	104,782	98,923
Other Assets	116,534	113,157
Total Assets	4,875,703	5,222,582
Current Liabilities:
Accounts payable and accrued expenses	582,976	686,956
Accrued compensation	214,556	209,852
Total Current Liabilities	797,532	896,808
Commitments and Contingencies (Note 6)
Shareholders' Equity:
Preferred stock, no par value authorized 5,000,000 shares, none issued and none outstanding at August 31, 2018 and May 31, 2018
Common stock, $0.08 par value authorized 25,000,000 shares, issued and outstanding 8,953,832 at August 31, 2018 and 8,888,011 at May 31, 2018	716,305	711,040
Additional paid-in-capital	21,034,686	20,843,550
Subscriptions receivable		(9,062)
Accumulated other comprehensive loss	(27,462)	(26,136)
Accumulated deficit	(17,645,358)	(17,193,618)
Total Shareholders' Equity	4,078,171	4,325,774
Total Liabilities and Shareholders' Equity	$ 4,875,703	$ 5,222,582