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Consolidated Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net income | $ 11,757,460 | $ 8,466,680 | $ 4,315,995
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 4,525,247 | 4,002,391 | 3,320,352
Stock-based compensation expense | 1,151,199 | 1,190,697 | 1,102,617
Deferred income taxes | (10,269) | 1,989,708 | 1,953,946
Provision for doubtful accounts | 135,353 | 331,528 | 302,723
Provision for inventory | 1,310,953 | 1,427,862 | 699,057
Tax benefit from exercise of stock options | (452,471) | (274,190) | (65,434)
Non-cash restructuring and impairment charges | 1,604,256 |  |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (4,271,129) | (2,998,037) | (3,716,478)
Inventories | (2,370,318) | 224,714 | (1,220,359)
Prepaid expenses and other current assets | 200,453 | 947,263 | 445,650
Long-term deposits and other | 33,995 | 179,939 | 28,239
Accounts payable | (2,879,330) | (6,594,292) | 5,784,731
Accrued expenses | 1,420,131 | 1,042,845 | (2,188,082)
Deferred revenue | (2,858,262) | (213,888) | (2,751,468)
Income taxes payable | 1,268,442 | 450,482 |
Other long-term liabilities | (17,033) | (568) | (158,028)
Net cash provided by operating activities | 10,548,677 | 10,173,134 | 7,853,461
Cash flows from investing activities: |  |  |
Purchase of property and equipment, net | (1,504,707) | (1,400,348) | (2,784,977)
Reduction in purchase price of acquisition |  |  | 105,300
Net cash used in investing activities | (1,504,707) | (1,400,348) | (2,679,677)
Cash flows from financing activities: |  |  |
Principal payments on debt | (1,600,000) | (1,600,000) | (1,600,000)
Proceeds from exercise of stock options | 388,675 | 160,470 | 197,246
Tax benefit from exercise of stock options | 452,471 | 274,190 | 65,434
Net cash used in financing activities | (758,854) | (1,165,340) | (1,337,320)
Exchange rate impact on cash | 5,139 | (32,156) | (61,522)
Increase in cash and cash equivalents | 8,290,255 | 7,575,290 | 3,774,942
Cash and cash equivalents at beginning of period | 35,777,222 | 28,201,932 | 24,426,990
Cash and cash equivalents at end of period | 44,067,477 | 35,777,222 | 28,201,932
Supplemental disclosure of cash flow information: |  |  |
Cash paid for income taxes | 6,496,000 | 2,651,212 | 360,000
Cash paid for interest | $ 184,881 | $ 193,880 | $ 222,919

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