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Note 8 - Subsequent Event - Acquisition of Guaranty Bank and Trust Company (Details Textual) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Sep. 27, 2017 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 29, 2017 | Dec. 31, 2016
Share Price |  |  |  |  |  | $ 45.50 |
Repayments of Long-term Debt |  |  |  | $ 9,500,000 |  |  |
Assets |  |  |  | 3,550,463,094 | $ 3,280,986,109 |  | $ 3,301,943,748
Loans and Leases Receivable, Net Amount |  |  |  | 2,641,772,470 |  |  | 2,374,729,537
Deposits |  |  |  | $ 2,894,268,482 |  |  | $ 2,669,261,273
Term Note [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 7,000,000 |  |  |  |  |
Debt Instrument, Term |  | 4 years |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 4.34% |  |  |
Term Note [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 437,500 |  |  |  |
Term Note [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.00% |  |  |  |  |
Subsequent Event [Member] | Guaranty Bank and Trust Company [Member] |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Percentage of Aggregate Consideration | 79.00% |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 678,670 |  |  |  |  |  |
Payments to Acquire Businesses, Gross, Percentage of Aggregate Consideration | 21.00% |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 7,800,000 |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 30,900,000 |  |  |  |  |  |
Business Combination, Consideration Transferred | 38,700,000 |  |  |  |  |  |
Subsequent Event [Member] | Guaranty Bank and Trust Company [Member] | Minimum [Member] | Core Deposits [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 2,500,000 |  |  |  |  |  |
Subsequent Event [Member] | Guaranty Bank and Trust Company [Member] | Maximum [Member] | Core Deposits [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 4,500,000 |  |  |  |  |  |
Guaranty Bank and Trust Company [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Number of Branches | 5 |  |  |  |  |  |
Assets | $ 257,200,000 |  |  |  |  |  |
Loans and Leases Receivable, Net Amount | 196,100,000 |  |  |  |  |  |
Deposits | $ 212,300,000 |  |  |  |  |  |

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