Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 3,608,182	$ 4,124,234
Investments	30,000	30,000
Trade accounts receivable, less allowance for doubtful accounts of $6,000 on March 31, 2013 and December 31, 2012	1,233,517	1,031,405
Other receivables	2,002	27,167
Inventories, net	1,021,331	1,138,482
Prepaid expenses and other current assets	359,608	240,870
Total current assets	6,254,640	6,592,158
Equipment and leasehold improvements, net	2,852,563	3,027,671
Other assets, net	29,214	29,829
Total assets	9,136,417	9,649,658
Current liabilities:
Current portion of capital lease obligations	29,148	34,526
Accounts payable	721,358	680,452
Accrued expenses	376,341	484,460
Total current liabilities	1,126,847	1,199,438
Long-term portion of capital lease obligations	33,652	62,755
Long-term deferred rent	635,634	636,628
Asset retirement obligations	155,416	153,967
Total long-term liabilities	824,702	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 March 31, 2013 and December 31, 2012, respectively	284,682	284,582
Additional paid-in capital	95,584,143	95,512,065
Accumulated deficit	(88,683,957)	(88,199,777)
Total stockholders' equity	7,184,868	7,596,870
Total liabilities and stockholders' equity	$ 9,136,417	$ 9,649,658