CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Nov. 30, 2018	May 31, 2018
Current Assets:
Cash and cash equivalents	$ 1,124,914	$ 1,204,903
Accounts receivable, less allowance for doubtful accounts of $70,887 and $57,695 as of November 30, 2018 and May 31, 2018, respectively	1,260,547	799,940
Inventories, net	2,115,041	2,178,777
Prepaid expenses and other	187,009	300,409
Total current assets	4,687,511	4,484,029
Property and Equipment, net of accumulated depreciation and amortization of $1,716,810 and $1,661,128 as of November 30, 2018 and May 31, 2018, respectively	348,547	351,149
Deferred Tax Assets	10,000	10,000
Investments	165,324	165,324
Intangible Assets, net	97,529	98,923
Other Assets	119,851	113,157
Total Assets	5,428,762	5,222,582
Current Liabilities:
Accounts payable and accrued expenses	800,470	686,956
Accrued compensation	216,280	209,852
Total current liabilities	1,016,750	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 November 30, 2018 and May 31, 2018
Common stock, $0.08 par value authorized 25,000,000 shares, issued and outstanding 9,289,267 and 8,888,011 at November 30, 2018 and May 31, 2018, respectively	743,140	711,040
Additional paid-in-capital	21,823,416	20,843,550
Subscriptions receivable		(9,062)
Accumulated other comprehensive loss	(31,942)	(26,136)
Accumulated deficit	(18,122,602)	(17,193,618)
Total Shareholders' Equity	4,412,012	4,325,774
Total Liabilities and Shareholders' Equity	$ 5,428,762	$ 5,222,582

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