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Note 16 - Shareholders' Equity (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 15, 2010 | Jan. 31, 2021 | Oct. 31, 2020 | Jan. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 14, 2010
Stock Issued During Period, Shares, Acquisitions (in shares) | 3,360,000 |  |  |  |  |  |  |
Stock Issued During Period at Purchase Price Per Share, Acquisition (in dollars per share) | $ 15 |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 50,400,000 |  |  |  |  |  |  |
Percentage of Shares Sold of Common Stock Issued and Outstanding | 87.60% |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 |  | $ 2
Common Stock, Shares Authorized (in shares) | 100,000,000 |  |  |  | 100,000,000 | 100,000,000 |  |
Payments of Ordinary Dividends, Common Stock |  |  |  |  | $ 0 | $ 155,000 | $ 154,000 |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  |  |  |  |  | $ 0.01 | $ 0.01 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  |  |  | 3,039 | 3,555 |  |
Holdings [Member] |  |  |  |  |  |  |  |
Shares Transferred to Investors (in shares) |  |  | 25,836 | 840,000 |  |  |  |
Holdings [Member] | Patriot National Bancorp, Inc. [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  | 56.70% |  |  |
Holdings [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Shares Transferred to Investors (in shares) |  | 256,629 |  |  |  |  |  |

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