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BALANCE SHEETS (USD $)
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 3,161,155 $ 4,124,234
Investments 30,000 30,000
Trade accounts receivable, less allowance for doubtful accounts of $6,000 on June 30, 2013 and December 31, 2012 1,598,782 1,031,405
Other receivables 2,002 27,167
Inventories, net 903,298 1,138,482
Prepaid expenses and other current assets 282,238 240,870
Total current assets 5,977,475 6,592,158
Equipment and leasehold improvements, net 2,681,242 3,027,671
Other assets, net 28,595 29,829
Total assets 8,687,312 9,649,658
Current liabilities:    
Current portion of capital lease obligations 29,596 34,526
Accounts payable 530,609 680,452
Accrued expenses 506,631 484,460
Total current liabilities 1,066,836 1,199,438
Long-term portion of capital lease obligations 26,083 62,755
Long-term deferred rent 634,640 636,628
Asset retirement obligations 156,902 153,967
Total long-term liabilities 817,625 853,350
Stockholders' equity:    
Preferred stock, $.01 par value, 24,088 shares authorized and no shares issued and outstanding      
Common stock, $.01 par value, 35,000,000 shares authorized; 28,468,162 and 28,458,162 shares issued and outstanding on June 30, 2013 and December 31, 2012, respectively 284,682 284,582
Additional paid-in capital 95,653,720 95,512,065
Accumulated deficit (89,135,551) (88,199,777)
Total stockholders' equity 6,802,851 7,596,870
Total liabilities and stockholders' equity $ 8,687,312 $ 9,649,658