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Note 1 - Nature of Business and Significant Accounting Policies (Details Textual) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) shares | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) shares | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Oct. 01, 2017 USD ($) | Aug. 31, 2005 USD ($)
Number of Subsidiaries | 4 |  |  |  |  |  |  |  | 4 |  |  |  |
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities |  |  |  |  |  |  |  |  | 6 |  |  |  |
Cash Reserve Deposit Required and Made | $ 41,803,000 |  |  |  | $ 42,233,000 |  |  |  | $ 41,803,000 | $ 42,233,000 |  |  |
Initial Direct Leasing Costs As a Percentage of Cost | 5.50% |  |  |  |  |  |  |  | 5.50% |  |  |  |
Financing Receivable, Lines of Credit Maximum Term |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Commercial Real Estate Owner Occupied, Percentage | 26.00% |  |  |  | 30.00% |  |  |  | 26.00% | 30.00% |  |  |
Lending Threshold Requiring Additional Loan Review | $ 1,000,000 |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Goodwill | $ 28,334,092 |  |  |  | $ 13,110,913 |  |  |  | 28,334,092 | $ 13,110,913 | $ 3,222,688 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Swap Fee Income |  |  |  |  |  |  |  |  | $ 3,094,939 | $ 1,708,204 | $ 1,717,552 |  |
Preferred Stock, Shares Authorized | shares | 250,000 |  |  |  | 250,000 |  |  |  | 250,000 | 250,000 | 250,000 |  |
Preferred Stock, Shares Outstanding | shares | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | $ 1,187,035 | $ 947,174 | $ 941,469 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares | 354,269 |  |  |  | 385,372 |  |  |  | 354,269 | 385,372 | 405,832 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 13,200,000 |  |  |  |  |  |  |  | $ 13,200,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | 10,500,000 |  |  |  |  |  |  |  | 10,500,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  |  | 1,055,193 | $ 1,525,902 | $ 480,354 |  |
Income Tax Expense (Benefit) | (2,000,105) | $ 1,921,533 | $ 2,635,576 | $ 2,389,446 | $ 2,872,412 | $ 1,858,208 | $ 2,153,144 | $ 2,019,023 | 4,946,450 | 8,902,787 | 3,669,242 |  |
Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  | 304,000 |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (1,200,000) |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | 554,435 | 424,904 | 393,114 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 961,972 |  |  |  |  |  |  |  | $ 961,972 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  | 1 year 335 days |  |  |  |
In The Money Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares | 495,004 |  |  |  |  |  |  |  | 495,004 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | $ 552,907 | 460,853 | $ 492,410 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 1,210,425 |  |  |  |  |  |  |  | $ 1,210,425 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  | 2 years 219 days |  |  |  |
m2 Lease Funds, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,222,688
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  | 80.00%
Community State Bank Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 9,888,225 |  |  |  |  | $ 9,888,225 |  |  |
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 15,223,179 |  |  |  |  |  |  |  | $ 15,223,179 |  |  | $ 15,223,179 |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Subsidiaries [Member] | Fixed Rate Residential Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Term |  |  |  |  |  |  |  |  |  | 15 years |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Term Loans, Generally Maximum Term |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and Leases Receivable, Lending Limits Percent | 300.00% |  |  |  |  |  |  |  | 300.00% |  |  |  |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and Leases Receivable, Lending Limits Percent | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Residual Value Percent of Cost | 3.00% |  |  |  |  |  |  |  | 3.00% |  |  |  |
Minimum [Member] | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Term |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Minimum [Member] | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Term |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Residual Value Percent of Cost | 25.00% |  |  |  |  |  |  |  | 25.00% |  |  |  |
Maximum [Member] | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Term |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Maximum [Member] | Special Mention [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Weaknesses Borrowers, Term |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Maximum [Member] | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Term |  |  |  |  |  |  |  |  | 5 years |  |  |  |

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