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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income (loss) | $ (7,038,772) | $ (8,049,815) | $ (1,003,938)
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities: |  |  |
Depreciation and amortization expense | 2,982,703 | 2,647,753 | 2,396,908
Deferred tax expense | 81,886 | 4,206,753 | 619,580
Share-based compensation | 1,364,698 | 1,115,063 | 852,102
Share-based compensation (foundation contribution) | 0 | 372,500 | 0
Excess tax (benefit) expense derived from exercise of stock options | (81,886) | (91,109) | 1,026,413
Noncash interest expense | 99,883 | 77,911 | 84,539
Noncash investment gains | (168,440) | (52,012) | (74,015)
Net changes in assets and liabilities affecting operating activities: |  |  |
Accounts receivable | 550,863 | (1,064,985) | (1,253,007)
Inventories | 460,505 | (1,366,118) | (1,101,586)
Prepaid, other current assets and other assets | 712,149 | (1,074,369) | (1,556,282)
Accounts payable and other current liabilities | 4,308,706 | 2,307,617 | 191,901
Other long-term liabilities | (159,558) | 413,097 | 386,863
Net cash provided by (used in) operating activities | 3,112,737 | (557,714) | 569,478
Cash flows from investing activities: |  |  |
Additions to property and equipment | (455,569) | (275,960) | (130,872)
Additions to intangible assets | (3,819,486) | (1,213,110) | (2,000,226)
Cash paid for acquisition | (20,000,000) | 0 | 0
Proceeds from sale of marketable securities | 16,663,232 | 13,381,061 | 4,489,111
Purchases of marketable securities | (20,112,995) | (2,379,414) | (5,473,092)
Net cash provided by (used in) investing activities | (27,724,818) | 9,512,577 | (3,115,079)
Cash flows from financing activities: |  |  |
Borrowings on line of credit | 56,000,000 | 24,500,000 | 2,400,000
Repayments on line of credit | (45,800,000) | (18,800,000) | 0
Repurchase of common shares | (2,879,426) | (3,724,375) | (2,520,715)
Payments of deferred equity offering costs | (383,310) | (27,950) | 0
Exercise of stock options | 200,909 | 0 | 0
Excess tax (expense) benefit derived from exercise of stock options | 0 | 0 | (1,026,413)
Net cash provided by (used in) financing activities | 7,138,173 | 1,947,675 | (1,147,128)
Net increase (decrease) in cash and cash equivalents | (17,473,908) | 10,902,538 | (3,692,729)
Cash and cash equivalents, beginning of year | 45,412,868 | 34,510,330 | 38,203,059
Cash and cash equivalents, end of year | 27,938,960 | 45,412,868 | 34,510,330
Net cash paid (refunded) during the year for: |  |  |
Interest | 95,965 | 14,993 | 21,853
Income taxes | 15,441 | 18,000 | (8,359)
Noncash investing and financing activities: |  |  |
Change in unpaid invoices for purchases of intangibles | (539,467) | (513,481) | (1,179,394)
Deferred offering costs included in accounts payable and other accrued expenses | 0 | 97,254 | 0
Non cash increase in liabilities related to acquisition (see Note 3) | $ 14,034,000 | $ 0 | $ 0

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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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