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v3.19.1

Note 1 - Nature of Business and Significant Accounting Policies (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 27, 2017 | Dec. 31, 2018 USD ($) subsidiary shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Jan. 01, 2019 | Sep. 30, 2018 USD ($)
Number of subsidiaries commercial banks | subsidiary |  | 5 |  |  |  |
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities | subsidiary |  | 6 |  |  |  |
Cash Reserve Deposit Required and Made |  | $ 33,372,000 | $ 41,803,000 |  |  |
Initial Direct Leasing Costs As a Percentage of Cost |  | 5.50% |  |  |  |
Financing Receivable, Lines of Credit Maximum Term |  | 1 year |  |  |  |
Commercial Real Estate Owner Occupied, Percentage |  | 28.00% | 26.00% |  |  |
Lending Threshold Requiring Additional Loan Review |  | $ 1,000,000 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  |  | $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  | 358,270 | 354,269 | 385,372 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  | $ 7,100,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  | 6,300,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 365,107 | $ 1,005,193 | $ 1,525,902 |  |
Preferred Stock, Shares Authorized | shares |  | 250,000 | 250,000 |  |  |
Preferred Stock, Shares Outstanding | shares |  | 0 | 0 |  |  |
Allocated Share-based Compensation Expense |  | $ 1,443,346 | $ 1,187,036 | 947,174 |  |
AOCI to retained earnings |  | 304,000 |  |  |  |
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Initial Direct Leasing Costs As a Percentage of Cost |  |  |  |  | 4.90% |
Employee Stock Option |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 704,659 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 7 months 28 days |  |  |  |
Allocated Share-based Compensation Expense |  | $ 471,849 | 554,435 | 424,904 |  |
In The Money Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  | 411,030 |  |  |  |
Restricted Stock |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 1,976,929 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 6 months 4 days |  |  |  |
Allocated Share-based Compensation Expense |  | $ 856,731 | $ 552,907 | $ 460,853 |  |
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |
Debt Instrument, Term | 4 years |  |  |  |  |
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% |  |  |  |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Loan and Leases Receivable, Lending Limits Percent |  | 100.00% |  |  |  |
Minimum |  |  |  |  |  |
Residual Value Percent of Cost |  | 3.00% |  |  |  |
Minimum | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Term |  | 1 year |  |  |  |
Minimum | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |  |
Financing Receivable, Term |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |
Residual Value Percent of Cost |  | 25.00% |  |  |  |
Permanent loans term |  | 20 years |  |  |  |
Maximum | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Term |  | 5 years |  |  |  |
Maximum | Special Mention [Member] |  |  |  |  |  |
Financing Receivable, Credit Weaknesses Borrowers, Term |  | 365 days |  |  |  |
Maximum | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |  |
Financing Receivable, Term |  | 5 years |  |  |  |
Core Deposits [Member] |  |  |  |  |  |
Estimated useful life |  | 10 years |  |  |  |
Customer Lists [Member] |  |  |  |  |  |
Estimated useful life |  | 15 years |  |  |  |

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