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