CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Feb. 28, 2018	May 31, 2017
Current Assets:
Cash and cash equivalents	$ 597,030	$ 1,225,462
Accounts receivable, less allowance for doubtful accounts of $54,486 and $50,129 as of February 28, 2018 and May 31, 2017, respectively	1,157,633	1,060,011
Inventories, net	1,953,655	1,729,121
Prepaid expenses and other	340,607	195,757
Total current assets	4,048,925	4,210,351
Property and Equipment, net of accumulated depreciation and amortization of $1,637,552 and $1,550,073 as of February 28, 2018 and May 31, 2017, respectively	318,681	331,857
Deferred Tax Assets	41,000	41,000
Investments	165,324	165,324
Intangible Assets, net	122,084	174,469
Other Assets	63,164	94,989
Total Assets	4,759,178	5,017,990
Current Liabilities:
Accounts payable and accrued expenses	562,498	352,000
Accrued compensation	196,801	176,866
Total current liabilities	759,299	528,866
Commitments and Contingencies (Note 5)
Shareholders' Equity:
Preferred stock, no par value authorized 5,000,000 shares, none issued and none outstanding at February 28, 2018 and May 31, 2017
Common stock, $0.08 par value authorized 25,000,000 shares, issued and outstanding 8,621,929 and 8,511,173 at February 28, 2018 and May 31, 2017, respectively	689,753	680,893
Additional paid-in-capital	19,890,568	19,551,855
Subscriptions receivable	(32,299)
Accumulated other comprehensive loss	(22,142)	(15,834)
Accumulated deficit	(16,526,001)	(15,727,790)
Total Shareholders' Equity	3,999,879	4,489,124
Total Liabilities and Shareholders' Equity	$ 4,759,178	$ 5,017,990

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682