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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
Feb. 28, 2014
May 31, 2013
Current Assets:    
Cash and cash equivalents $ 1,665,690 $ 2,469,796
Accounts receivable, less allowance for doubtful accounts of $120,405 and $115,730 as of February 28, 2014 and May 31, 2013, respectively 1,171,767 871,660
Inventories, net 1,938,341 1,571,221
Prepaid expenses and other 141,007 196,678
Deferred tax assets, current portion 144,000 144,000
Total current assets 5,060,805 5,253,355
Property and equipment, net of accumulated depreciation and amortization of $1,163,523 and $844,684 as of February 28, 2014 and May 31, 2013, respectively 640,471 654,620
Deferred tax assets, net of current portion 85,000 85,000
Investments 165,324 165,324
Intangible assets, net 248,090 165,200
Other assets 71,388 71,388
Total assets 6,271,078 6,394,887
Current Liabilities:    
Accounts payable and accrued expenses 423,130 351,917
Accrued compensation 120,322 207,976
Total current liabilities 543,452 559,893
Commitments and Contingencies (Note 6)      
Shareholders' Equity:    
Preferred stock, no par value authorized 5,000,000 shares, none issued and none outstanding at February 28, 2014 and May 31, 2013      
Common stock, $0.08 par value authorized 25,000,000 shares, issued and outstanding 7,513,714 and 7,274,714 at February 28, 2014 and May 31, 2013, respectively 601,096 581,976
Additional paid-in-capital 18,293,554 18,034,396
Accumulated other comprehensive loss (10,120) (9,006)
Accumulated deficit (13,156,904) (12,772,372)
Total Shareholders' Equity 5,727,626 5,834,994
Total Liabilities and Shareholders' Equity $ 6,271,078 $ 6,394,887