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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Cash flows from operating activities:  
Net income$ 4,718,388$ 1,594,871
Adjustments to reconcile net income to net cash flows from operating activities:  
Depreciation and amortization expense801,483723,687
Non-employee equity compensation119,31362,547
Stock-based compensation - employee stock options467,850503,446
Excess tax benefit derived from exercise of stock options(2,657,259)(1,256,913)
Non-cash interest expense131,469328,475
Net changes in assets and liabilities affecting operating activities:  
Accounts receivable640,0831,384,903
Inventory809,243(2,823,355)
Other current assets and other assets(1,240,700)1,461,538
Accounts payable and other accrued liabilities3,911,450(840,429)
Other long-term obligations(9,262)(105,668)
Net cash provided by operating activities7,692,0581,033,102
Cash flows from investing activities:  
Additions to property and equipment(241,885)(311,301)
Additions to patents(140,356)(132,047)
Net cash used in investment activities(382,241)(443,348)
Cash flows from financing activities:  
Principal payments on note payable(5,333,333)(12,000,000)
Net borrowings on line of credit2,750,000 
Costs of financing for long-term debt and credit facility (82,500)
Proceeds from exercise of stock options681,6341,182,139
Excess tax benefit derived from exercise of stock options2,657,2591,256,913
Repurchase of common shares(2,884,540)(4,129,648)
Net cash used in financing activities(2,128,980)(13,773,096)
Net increase (decrease) in cash and cash equivalents5,180,837(13,183,342)
Cash and cash equivalents at beginning of period65,893,97078,701,682
Cash and cash equivalents at end of period71,074,80765,518,340
Non-cash investing and financing activities:  
Common shares repurchased during period but not paid as of the end of the period $ 22,207