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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net Income | $ 37,074,497 | $ 31,580,931 | $ 22,154,828
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 625,788 | 301,936 | 306,005
Stock-based compensation | 8,551,734 | 7,303,799 | 7,319,401
Increase in accounts receivable | (2,065,156) | (3,511,851) | (2,563,697)
Change in current income taxes | 316,910 | (3,324,298) | 8,520,834
Change in deferred income taxes | (3,547,087) | 2,404,433 | (5,616,211)
Net unrealized losses (gains) on investments | 1,860,360 | (1,517,662) | (4,270,928)
Increase in accrued incentive compensation | 5,829,708 | 4,127,457 | 8,304,806
Increase in deferred compensation | 4,557,979 | 4,391,019 | 493,101
Excess income tax benefit from stock-based compensation | (2,521,273) | (666,889) | (425,380)
Income tax benefit from dividends paid on unvested shares | (376,394) | (296,755) | (357,188)
Other changes in assets and liabilities | 1,724,253 | 1,827,723 | 715,570
Net cash provided by operating activities | 52,031,319 | 42,619,843 | 34,581,141
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchase of property and equipment | (1,550,857) | (1,504,368) | (525,472)
Cost of investments purchased and other portfolio activity | (22,095,491) | (25,433,201) | (2,306,947)
Proceeds from sale of investments | 11,770,565 | 249,477 | 4,355,536
Net cash provided by (used in) investing activities | (11,875,783) | (26,688,092) | 1,523,117
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Value of shares withheld related to employee tax withholding | (4,323,676) | (976,343) | (1,884,187)
Excess income tax benefit from stock-based compensation | 2,521,273 | 666,889 | 425,380
Income tax benefit from dividends paid on unvested shares | 376,394 | 296,755 | 357,188
Payment of dividends | (17,031,890) | (13,248,884) | (9,766,575)
Net cash used in financing activities | (18,457,899) | (13,261,583) | (10,868,194)
CASH AND CASH EQUIVALENTS |  |  |
Net change during the year | 21,697,637 | 2,670,168 | 25,236,064
At beginning of year | 35,777,140 | 33,106,972 | 7,870,908
At end of year | 57,474,777 | 35,777,140 | 33,106,972
Supplemental cash flow information: |  |  |
Income taxes paid | 24,138,841 | 19,704,817 | 10,575,000
Supplemental disclosure of non-cash transactions: |  |  |
Common stock issued as incentive compensation | 3,826,458 | 3,984,816 | 4,606,008
Charitable donation of corporate investments | $ 1,401,202 | $ 0 | $ 0

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