Note 10 - Financial Instruments - Assets Recorded at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment securities available for sale	$ 107,422	$ 33,507
Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0	0
Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	107,422	33,507
Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0	0
US Government Agencies Debt Securities [Member]
Investment securities available for sale	15,239
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	15,239
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0
Collateralized Mortgage Backed Securities [Member]
Investment securities available for sale	55,706	15,684
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0	0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	55,706	15,684
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0	0
Corporate Debt Securities [Member]
Investment securities available for sale	1,500	1,500
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	1,500	1,500
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale	34,977	16,323
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	34,977	16,323
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	$ 0	$ 0