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Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities:    
Net loss $ (484,180) $ (774,122)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 226,225 253,712
Gain on disposal of equipment (6,000)  
Stock compensation expense 77,002 82,407
Changes in assets and liabilities related to operations:    
Trade accounts receivable (202,112) (299,029)
Other accounts receivable 25,165 (317,298)
Inventories 117,151 67,205
Prepaid expenses and other assets (118,738) 47,397
Accounts payable 53,967 378,708
Accrued expenses (116,937) (76,063)
Deferred other revenue   279,000
Net cash used in operating activities (428,457) (358,083)
Investing activities:    
Proceeds from disposal of equipment 6,000  
Acquisition of equipment and leasehold improvements (41,710) (4,434)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements (20,404) (14,941)
Net cash used in investing activities (56,114) (19,375)
Financing activities:    
Principal payments on capital leases (34,481) (859)
Proceeds from exercise of stock options 3,000  
Net cash used in financing activities (31,481) (859)
Decrease in cash and cash equivalents (516,052) (378,317)
Cash and cash equivalents at beginning of period 4,124,234 2,693,623
Cash and cash equivalents at end of period 3,608,182 2,315,306
Supplemental cash flow information:    
Interest paid 7,354 1,105
Supplemental non-cash investing and financing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 7,343  
Capital lease obligations incurred for the purchase of equipment   $ 32,360