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Consolidated Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 20,574,521 | $ 11,757,460 | $ 8,466,680
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 4,772,491 | 4,525,247 | 4,002,391
Stock-based compensation expense | 1,268,070 | 1,151,199 | 1,190,697
Deferred income taxes | 2,205,608 | (10,269) | 1,989,708
Provision for doubtful accounts | 238,071 | 135,353 | 331,528
Provision for inventory | 171,089 | 1,310,953 | 1,427,862
Gain on sale of assets | (126,284) |  |
Tax benefit from exercise of stock options | (856,830) | (452,471) | (274,190)
Restructuring (credits) charges | (160,559) | 1,604,256 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 2,411,247 | (4,271,129) | (2,998,037)
Inventories | (2,823,059) | (2,370,318) | 224,714
Prepaid expenses and other current assets | 204,519 | 200,453 | 947,263
Long-term deposits and other | 101,986 | 33,995 | 179,939
Accounts payable | 622,928 | (2,879,330) | (6,594,292)
Accrued expenses | (376,897) | 1,420,131 | 1,042,845
Deferred revenue | (2,795,285) | (2,858,262) | (213,888)
Income taxes payable | 152,364 | 1,268,442 | 450,482
Other long-term liabilities | (418,979) | (17,033) | (568)
Net cash provided by operating activities | 25,165,001 | 10,548,677 | 10,173,134
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (440,890) | (1,504,707) | (1,400,348)
Proceeds from sale of assets | 187,735 |  |
Net cash used in investing activities | (253,155) | (1,504,707) | (1,400,348)
Cash flows from financing activities: |  |  |
Principal payments on debt | (9,600,000) | (1,600,000) | (1,600,000)
Proceeds from exercise of stock options | 3,053,941 | 388,675 | 160,470
Tax benefit from exercise of stock options | 856,830 | 452,471 | 274,190
Net cash used in financing activities | (5,689,229) | (758,854) | (1,165,340)
Exchange rate impact on cash | 43,066 | 5,139 | (32,156)
Increase in cash and cash equivalents | 19,265,683 | 8,290,255 | 7,575,290
Cash and cash equivalents at beginning of period | 44,067,477 | 35,777,222 | 28,201,932
Cash and cash equivalents at end of period | 63,333,160 | 44,067,477 | 35,777,222
Supplemental disclosure of cash flow information: |  |  |
Cash paid for income taxes | 9,841,546 | 6,496,000 | 2,651,212
Cash paid for interest | $ 125,978 | $ 184,881 | $ 193,880

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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