BALANCE SHEETS (USD $)	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 3,307,104	$ 4,124,234
Investments	30,000	30,000
Trade accounts receivable, less allowance for doubtful accounts of $6,000 on September 30, 2013 and December 31, 2012	988,304	1,031,405
Other receivables	844	27,167
Inventories, net	990,756	1,138,482
Prepaid expenses and other current assets	226,894	240,870
Total current assets	5,543,902	6,592,158
Equipment and leasehold improvements, net	2,629,851	3,027,671
Other assets, net	27,971	29,829
Total assets	8,201,724	9,649,658
Current liabilities:
Current portion of capital lease obligations	30,052	34,526
Accounts payable	583,424	680,452
Accrued expenses	553,685	484,460
Total current liabilities	1,167,161	1,199,438
Long-term portion of capital lease obligations	18,397	62,755
Long-term deferred rent	633,646	636,628
Asset retirement obligations	158,424	153,967
Total long-term liabilities	810,467	853,350
Contingent liabilities
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 September 30, 2013 and December 31, 2012, respectively	284,682	284,582
Additional paid-in capital	95,707,861	95,512,065
Accumulated deficit	(89,768,447)	(88,199,777)
Total stockholders' equity	6,224,096	7,596,870
Total liabilities and stockholders' equity	$ 8,201,724	$ 9,649,658