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Note 20 - Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net income (loss) | $ 13,315,518 | $ 8,808,835 | $ 10,445,385 | $ 10,549,961 | $ 9,901,590 | $ 7,853,935 | $ 8,766,017 | $ 9,184,965 | $ 43,119,699 | $ 35,706,507 | $ 27,686,787
Depreciation |  |  |  |  |  |  |  |  | 4,450,758 | 3,948,934 | 3,424,140
Stock-based compensation expense |  |  |  |  |  |  |  |  | 1,443,346 | 1,187,036 | 947,174
Securities gains, net |  |  |  |  |  |  |  |  |  | 87,885 | (4,592,398)
Losses on debt extinguishment, net |  |  |  |  |  |  |  |  |  |  | 4,577,668
Net decrease (increase) in interest-bearing deposits at financial institutions |  |  |  |  |  |  |  |  | (14,508,687) | 12,137,820 | (12,904,803)
Calls, maturities and redemptions |  |  |  |  |  |  |  |  | 23,931,014 | 43,010,478 | 117,876,284
Sales |  |  |  |  |  |  |  |  | 1,938,043 | 71,091,580 | 134,188,737
Purchase of premises and equipment |  |  |  |  |  |  |  |  | (11,457,086) | (5,760,802) | (6,032,416)
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (333,648,270) | (410,516,757) | (168,975,229)
Proceeds from other borrowings |  |  |  |  |  |  |  |  | 9,000,000 | 7,000,000 | 35,000,000
Calls, maturities and scheduled principal payments |  |  |  |  |  |  |  |  | (12,550,000) | (21,000,000) |
Prepayments |  |  |  |  |  |  |  |  |  |  | (69,769,000)
Retirement of junior subordinated debentures |  |  |  |  |  |  |  |  |  |  | (3,955,000)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 279,178,544 | 381,955,146 | 154,420,080
Net decrease in cash and due from banks |  |  |  |  |  |  |  |  | 9,801,022 | 5,151,670 | 28,827,672
Cash and due from banks, beginning |  |  |  | 75,721,663 |  |  |  | 70,569,993 | 75,721,663 | 70,569,993 | 41,742,321
Cash and due from banks, ending | 85,522,685 |  |  |  | 75,721,663 |  |  |  | 85,522,685 | 75,721,663 | 70,569,993
Common Stock Offering 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  | 1,279,153 | 2,055,507 | 31,934,690
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 43,119,699 | 35,706,507 | 27,686,787
Accretion of acquisition fair value adjustments |  |  |  |  |  |  |  |  | 183,556 | 149,010 | 136,150
Depreciation |  |  |  |  |  |  |  |  | 248,827 | 225,947 | 222,256
Stock-based compensation expense |  |  |  |  |  |  |  |  | 1,443,346 | 1,187,036 | 947,174
Securities gains, net |  |  |  |  |  |  |  |  |  | (6,312) | (37,596)
Losses on debt extinguishment, net |  |  |  |  |  |  |  |  |  |  | (1,200,000)
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | 2,232,402 | (968,808) | (2,346,253)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  | (7,226,127) | (6,918,921) | 5,105,251
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 19,791,532 | 5,234,256 | 23,046,243
Net decrease (increase) in interest-bearing deposits at financial institutions |  |  |  |  |  |  |  |  | (999,951) | 50 | 50
Purchases |  |  |  |  |  |  |  |  |  |  | (3,873,060)
Calls, maturities and redemptions |  |  |  |  |  |  |  |  |  | (6,312) | (3,800,000)
Sales |  |  |  |  |  |  |  |  |  | 31,713 | 132,738
Capital infusion, bank subsidiaries |  |  |  |  |  |  |  |  | (3,500,000) |  |
Net cash paid for acquisitions |  |  |  |  |  |  |  |  | (5,182,804) | (3,368,909) | (80,000,000)
Purchase of premises and equipment |  |  |  |  |  |  |  |  | (2,257,295) | (68,842) | (824,498)
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | 11,940,050 | 3,399,676 | 80,764,770
Proceeds from other borrowings |  |  |  |  |  |  |  |  | 9,000,000 | 7,000,000 | 35,000,000
Calls, maturities and scheduled principal payments |  |  |  |  |  |  |  |  | (12,550,000) | (11,000,000) |
Retirement of junior subordinated debentures |  |  |  |  |  |  |  |  |  |  | (3,955,000)
Payment of cash dividends on common and preferred stock |  |  |  |  |  |  |  |  | (3,300,091) | (2,494,260) | (1,981,541)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (5,570,938) | (4,438,753) | 60,998,149
Net increase (decrease) in cash and due from banks |  |  |  |  |  |  |  |  | 2,280,544 | (2,604,173) | 3,279,622
Cash and due from banks, beginning |  |  |  | $ 4,325,582 |  |  |  | $ 6,929,755 | 4,325,582 | 6,929,755 | 3,650,133
Cash and due from banks, ending | $ 6,606,126 |  |  |  | $ 4,325,582 |  |  |  | 6,606,126 | 4,325,582 | 6,929,755
Parent Company [Member] | Common Stock Offering 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  | 1,279,153 | 2,055,507 | 31,934,690
Parent Company [Member] | Bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings of bank subsidiaries |  |  |  |  |  |  |  |  | (55,209,382) | (45,103,593) | (33,467,712)
Distributions from bank subsidiaries |  |  |  |  |  |  |  |  | 34,500,000 | 21,000,000 | 26,000,000
Parent Company [Member] | Non-bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings of bank subsidiaries |  |  |  |  |  |  |  |  | 435,941 | (75,344) | (32,674)
Distributions from bank subsidiaries |  |  |  |  |  |  |  |  | $ 63,270 | $ 38,734 | $ 32,860

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: 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 Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + 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://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 Amount of cash outflow for the payment of debt classified as other. + 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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