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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net income (loss) | $ 9,901,590 | $ 7,853,935 | $ 8,766,017 | $ 9,184,965 | $ 8,529,330 | $ 6,107,501 | $ 6,676,467 | $ 6,373,489 | $ 35,706,507 | $ 27,686,787 | $ 16,927,881
Stock-based compensation expense |  |  |  |  |  |  |  |  | 1,187,036 | 947,174 | 941,469
Securities gains, net |  |  |  |  |  |  |  |  | 87,885 | (4,592,398) | (798,983)
Net decrease (increase) in interest-bearing deposits at financial institutions |  |  |  |  |  |  |  |  | 12,137,820 | (12,904,803) | (979,283)
Calls, maturities and redemptions |  |  |  |  |  |  |  |  | 43,010,478 | 117,876,284 | 211,942,737
Sales |  |  |  |  |  |  |  |  | 71,091,580 | 134,188,737 | 81,410,368
Purchase of premises and equipment |  |  |  |  |  |  |  |  | (5,760,802) | (6,032,416) | (4,394,255)
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (410,516,757) | (168,975,229) | (66,073,152)
Proceeds from other borrowings |  |  |  |  |  |  |  |  | 7,000,000 | 35,000,000 |
Calls, maturities and scheduled principal payments |  |  |  |  |  |  |  |  | (21,000,000) |  | (7,350,000)
Prepayments |  |  |  |  |  |  |  |  |  | (69,769,000) | (34,559,000)
Retirement of junior subordinated debentures |  |  |  |  |  |  |  |  |  | (3,955,000) | (1,762,000)
Net proceeds from the common stock offering |  |  |  |  |  |  | $ 29,800,000 |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 381,955,146 | 154,420,080 | 39,481,832
Net increase (decrease) in cash and due from banks |  |  |  |  |  |  |  |  | 5,151,670 | 28,827,672 | 3,507,302
Cash and due from banks, beginning |  |  |  | 70,569,993 |  |  |  | 41,742,321 | 70,569,993 | 41,742,321 | 38,235,019
Cash and due from banks, ending | 75,721,663 |  |  |  | 70,569,993 |  |  |  | 75,721,663 | 70,569,993 | 41,742,321
Common Stock Offering 1 [Member] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the common stock offering |  |  |  |  |  |  |  |  |  | 29,828,916 | 63,484,123
Common Stock Offering 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the common stock offering |  |  |  |  |  |  |  |  | 2,055,507 | 2,105,774 | 1,552,673
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 35,706,507 | 27,686,787 | 16,927,881
Accretion of acquisition fair value adjustments |  |  |  |  |  |  |  |  | 149,010 | 136,150 | 137,317
Depreciation |  |  |  |  |  |  |  |  | 225,947 | 222,256 | 174,757
Stock-based compensation expense |  |  |  |  |  |  |  |  | 1,187,036 | 947,174 | 941,469
Securities gains, net |  |  |  |  |  |  |  |  | (6,312) | (37,596) | (262,801)
Gains on debt extinguishment |  |  |  |  |  |  |  |  |  | (1,200,000) | (300,000)
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | (968,808) | (2,346,253) | (5,929,110)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  | (6,918,921) | 5,105,251 | 5,502,390
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 5,234,256 | 23,046,243 | 4,832,689
Net decrease (increase) in interest-bearing deposits at financial institutions |  |  |  |  |  |  |  |  | 50 | 50 | 189,426
Purchases |  |  |  |  |  |  |  |  |  | (3,873,060) | (1,764,137)
Calls, maturities and redemptions |  |  |  |  |  |  |  |  | 6,312 | 3,800,000 | 1,772,719
Sales |  |  |  |  |  |  |  |  | 31,713 | 132,738 | 489,828
Capital infusion, bank subsidiaries |  |  |  |  |  |  |  |  |  |  | (45,600,000)
Net cash paid for acquisitions |  |  |  |  |  |  |  |  | (3,368,909) | (80,000,000) |
Purchase of premises and equipment |  |  |  |  |  |  |  |  | (68,842) | (824,498) | (1,517,157)
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (3,399,676) | (80,764,770) | (46,429,321)
Proceeds from other borrowings |  |  |  |  |  |  |  |  | 7,000,000 | 35,000,000 |
Calls, maturities and scheduled principal payments |  |  |  |  |  |  |  |  | (11,000,000) |  | (2,350,000)
Prepayments |  |  |  |  |  |  |  |  |  |  | (19,395,116)
Retirement of junior subordinated debentures |  |  |  |  |  |  |  |  |  | (3,955,000) | (1,762,000)
Payment of cash dividends on common and preferred stock |  |  |  |  |  |  |  |  | (2,494,260) | (1,981,541) | (782,054)
Net proceeds from the common stock offering |  |  |  |  |  |  |  |  | 2,055,507 | 2,105,774 | 1,552,673
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (4,438,753) | 60,998,149 | 40,747,626
Net increase (decrease) in cash and due from banks |  |  |  |  |  |  |  |  | (2,604,173) | 3,279,622 | (849,006)
Cash and due from banks, beginning |  |  |  | $ 6,929,755 |  |  |  | $ 3,650,133 | 6,929,755 | 3,650,133 | 4,499,139
Cash and due from banks, ending | $ 4,325,582 |  |  |  | $ 6,929,755 |  |  |  | 4,325,582 | 6,929,755 | 3,650,133
Parent Company [Member] | Common Stock Offering 1 [Member] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the common stock offering |  |  |  |  |  |  |  |  |  |  | 63,484,123
Parent Company [Member] | Common Stock Offering 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the common stock offering |  |  |  |  |  |  |  |  |  | 29,828,916 |
Parent Company [Member] | Bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings of bank subsidiaries |  |  |  |  |  |  |  |  | (45,103,593) | (33,467,712) | (22,059,086)
Distributions from bank subsidiaries |  |  |  |  |  |  |  |  | 21,000,000 | 26,000,000 | 9,700,000
Parent Company [Member] | Non-bank Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings of bank subsidiaries |  |  |  |  |  |  |  |  | (75,344) | (32,674) | (32,823)
Distributions from bank subsidiaries |  |  |  |  |  |  |  |  | $ 38,734 | $ 32,860 | $ 32,695

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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + 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/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&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://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=98514028&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://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=98514028&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://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=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral. + 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=98514028&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://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=98514028&loc=d3e3602-108585 + Details
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