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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents $ 11,418,360 $ 9,758,903
Short-term investments 3,871,147 4,423,763
Accounts receivable, less allowance for doubtful accounts of $51,153 and $36,694, respectively 9,723,090 9,513,894
Inventories 7,037,280 6,563,138
Other current assets 1,059,754 933,028
Total current assets 33,109,631 31,192,726
Property and equipment, net 2,543,865 2,350,760
Intangible assets 41,666 44,791
Long-term investments 600,000  
Other assets 292,918 270,613
Total Assets 36,588,080 33,858,890
Liabilities and Stockholders' Equity    
Accounts payable 5,229,096 5,270,084
Accrued liabilities 4,545,412 3,995,880
Current maturities of long-term debt and capital lease obligations 2,043,928 1,542,848
Total current liabilities 11,818,436 10,808,812
Long-term debt and capital lease obligations 7,872,712 4,925,775
Other liabilities 2,245,155 2,509,599
Total Liabilities 21,936,303 18,244,186
Commitments and contingencies (Note 7)      
Stockholders' Equity:    
Common stock, $.001 par value, 90,000,000 shares authorized and 16,485,281 and 16,369,221 issued and outstanding, respectively 16,485 16,369
Additional paid-in capital 119,456,229 118,852,948
Accumulated other comprehensive income (loss) 15,939 (37,517)
Accumulated deficit (104,836,876) (103,217,096)
Total Stockholders' Equity 14,651,777 15,614,704
Total Liabilities and Stockholders' Equity $ 36,588,080 $ 33,858,890