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Note 2 - Business Combination and Pending Acquisition (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Apr. 01, 2019 | Mar. 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill, Ending Balance | $ 28,388,000 |  | $ 28,388,000 |  |  |  | $ 28,388,000 |  | $ 28,388,000 |
Debt Securities, Available-for-sale, Realized Gain (Loss), Total |  |  |  |  |  |  | 0 | $ 0 |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  | 141,000 | 311,000 |  |
Assets, Total | 1,629,445,000 |  | 1,629,445,000 |  |  |  | 1,629,445,000 |  | 1,654,145,000 |
Liabilities, Total | 1,378,217,000 |  | 1,378,217,000 |  |  |  | 1,378,217,000 |  | 1,409,693,000 |
Stockholders' Equity Attributable to Parent, Ending Balance | $ 251,228,000 |  | $ 251,228,000 |  |  |  | 251,228,000 | 202,127,000 | $ 244,452,000 | $ 197,368,000
Average Closing Share Price (in dollars per share) | $ 18.87 |  | $ 19.96 | $ 25.90 | $ 27.37 |  |  |  |  |
Covenant Financial Inc. [Member] |  |  |  |  |  |  |  |  |  |
Assets, Total | $ 522,000,000 |  | $ 522,000,000 |  |  |  | 522,000,000 |  |  |
Liabilities, Total | 479,000,000 |  | 479,000,000 |  |  |  | 479,000,000 |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 43,000,000 |  | $ 43,000,000 |  |  |  | 43,000,000 |  |  |
Monument Bancorp, Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | $ 42,700,000 |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Cash, Net of Stock Issuance Costs |  | $ 9,600,000 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 1,279,825 |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Cash, Net of Stock Issuance Costs |  | $ 33,100,000 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interest Issuance Costs |  | 181,000 |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  | 16,400,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable |  | 259,295,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 223,300,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Short-term Borrowing |  | 111,600,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debt |  | 12,400,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  | 94,600,000 |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss), Total |  | 0 |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  | $ 311,000 |  |
Monument Bancorp, Inc [Member] | Subordinated debt, Redeemed April 1, 2019 [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debt |  | 5,400,000 |  |  |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total |  | 0 |  |  |  |  |  |  |  |
Monument Bancorp, Inc [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | $ 1,500,000 |  |  |  |  |  |  |  |
Covenant Financial Inc. [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  | $ 141,000 |  |  |
Business Combination, Percent Paid in Cash |  |  |  |  |  |  | 25.00% |  |  |
Business Combination, Percent Paid in Equity |  |  |  |  |  |  | 75.00% |  |  |
Business Combination, Consideration Transferred, Value Based on Ten Day Average Closing Stock Price | $ 60,000,000 |  |  |  |  |  |  |  |  |
Covenant Financial Inc. [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  |  |  | $ 77,000,000 |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | 7,400,000 |  |  |  |
Business Combination, Acquisition Related Costs, Net of Tax |  |  |  |  |  | $ 6,000,000 |  |  |  |

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