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Note 11 - Other Borrowings and Unused Lines of Credit - Springfield Bancshares (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 12, 2019 | Dec. 31, 2018 USD ($) item | Jun. 29, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Other borrowings |  | $ 72,032,318 |  | $ 66,000,000 |
London Interbank Offered Rate (LIBOR) |  |  |  |  |
Variable interest rate (as a percent) | 282.00% |  |  |  |
Revolving line of credit |  |  |  |  |
Other borrowings |  | 9,000,000 |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 10,000,000 |  |  | $ 10,000,000
Revolving line of credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Variable interest rate (as a percent) |  | 2.50% |  |  |
Subordinated debentures |  |  |  |  |
Other borrowings |  | $ 4,782,318 |  |  |
Springfield Bancshares |  |  |  |  |
Number of subordinated | item |  | 2 |  |  |
Market Value Discount per ASC 805 |  | $ 217,682 |  |  |
subordinated debentures fixed |  | 5 years |  |  |
Debentures may be called after a minimum |  | 5 years |  |  |
Line of credit |  | $ 9,000,000 |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 10,000,000 |  |
Springfield Bancshares | Subordinated debentures |  |  |  |  |
Other borrowings |  | 4,782,318 |  |  |
Springfield Bancshares | Subordinated debenture dated 4/30/16 |  |  |  |  |
Amount outstanding |  | $ 2,000,000 |  |  |
Interest Rate |  | 4.00% |  |  |
Springfield Bancshares | Subordinated debenture dated 9/15/16 |  |  |  |  |
Amount outstanding |  | $ 3,000,000 |  |  |
Interest Rate |  | 4.00% |  |  |

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