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Note 8 - Loans - Payment Defaults on TDR Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Troubled debt restructurings, number of loans | 11 | 0
Troubled debt restructurings, recorded investment | $ 530 | $ 0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] |  |
Troubled debt restructurings, number of loans | 1 | 0
Troubled debt restructurings, recorded investment | $ 261 | $ 0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] |  |
Troubled debt restructurings, number of loans | 1 | 0
Troubled debt restructurings, recorded investment | $ 18 | $ 0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |
Troubled debt restructurings, number of loans | 8 | 0
Troubled debt restructurings, recorded investment | $ 170 | $ 0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |
Troubled debt restructurings, number of loans | 1 | 0
Troubled debt restructurings, recorded investment | $ 81 | $ 0

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