CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Nov. 30, 2016	May 31, 2016
Current Assets:
Cash and cash equivalents	$ 1,611,148	$ 1,888,925
Accounts receivable, less allowance for doubtful accounts of $30,326 and $8,405 as of November 30, 2016 and May 31, 2016, respectively	1,140,687	969,474
Inventories, net	1,881,121	1,863,091
Prepaid expenses and other	139,084	113,578
Total current assets	4,772,040	4,835,068
Property and Equipment, net of accumulated depreciation and amortization of $1,479,082 and $1,423,900 as of November 30, 2016 and May 31, 2016, respectively	331,869	380,659
Deferred Tax Assets	41,000	41,000
Investments	165,324	165,324
Intangible Assets, net	212,279	248,801
Other Assets	62,915	55,653
Total Assets	5,585,427	5,726,505
Current Liabilities:
Accounts payable and accrued expenses	371,055	333,485
Accrued compensation	195,461	172,542
Total current liabilities	566,516	506,027
Commitments and Contingencies (Note 5)
Preferred stock, no par value authorized 5,000,000 shares, none issued and none outstanding at November 30, 2016 and May 31, 2016
Common stock, $0.08 par value authorized 25,000,000 shares, issued and outstanding 8,300,548 and 8,169,673 at November 30, 2016 and May 31, 2016, respectively	664,042	653,573
Additional paid-in-capital	19,447,044	19,399,720
Accumulated other comprehensive loss	(14,346)	(13,586)
Accumulated deficit	(15,077,829)	(14,819,229)
Total Shareholders' Equity	5,018,911	5,220,478
Total Liabilities and Shareholders' Equity	$ 5,585,427	$ 5,726,505

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.