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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
Nov. 30, 2013
May 31, 2013
Current Assets:    
Cash and cash equivalents $ 1,647,559 $ 2,469,796
Accounts receivable, less allowance for doubtful accounts of $120,405 and $115,730 as of November 30, 2013 and May 31, 2013, respectively 821,571 871,660
Inventories, net 1,899,633 1,571,221
Prepaid expenses and other 186,362 196,678
Deferred tax assets, current portion 144,000 144,000
Total current assets 4,699,125 5,253,355
Property and Equipment, net of accumulated depreciation and amortization of $1,118,240 and $1,032,009 as of November 30, 2013 and May 31, 2013, respectively 652,244 654,620
Deferred Tax Assets, net of current portion 85,000 85,000
Investments 165,324 165,324
Intangible Assets, net 154,079 165,200
Other Assets 71,388 71,388
Total Assets 5,827,160 6,394,887
Current Liabilities:    
Accounts payable and accrued expenses 279,974 351,917
Accrued compensation 120,618 207,976
Total current liabilities 400,592 559,893
Commitments and Contingencies (Note 5)      
Shareholders' Equity:    
Preferred stock, no par value authorized 5,000,000 shares, none issued and none outstanding at November 30, 2013 and May 31, 2013      
Common stock, $0.08 par value authorized 25,000,000 shares, issued and outstanding 7,279,214 and 7,274,714 at November 30 and May 31, 2013, respectively 582,336 581,976
Additional paid-in-capital 18,036,696 18,034,396
Accumulated other comprehensive loss (9,020) (9,006)
Accumulated deficit (13,183,444) (12,772,372)
Total Shareholders' Equity 5,426,568 5,834,994
Total Liabilities and Shareholders' Equity $ 5,827,160 $ 6,394,887