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Note 10 - Fair Value of Financial Instruments - (Details Textual) $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Recurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0
Fair Value, Nonrecurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0
Fair Value, Nonrecurring [Member] \| Measurement Input, Cost to Sell [Member] \| Fair Value, Inputs, Level 3 [Member]
Other Real Estate Owned, Measurement Input	0.10