Note 7 - Fair Value - Financial Assets At Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Securities	$ 132,634	$ 85,694
Certificates of Deposit [Member]
Securities	1,240	2,728
US States and Political Subdivisions Debt Securities [Member]
Securities	390
US Treasury and Government [Member]
Securities	125,005
Residential Mortgage-Backed Securities [Member]
Securities	4,538	4,833
Collateralized Mortgage-Backed Securities [Member]
Securities	1,461	1,580
US Treasury Securities [Member]
Securities	125,005	76,553
Fair Value, Inputs, Level 1 [Member]
Securities	125,005	76,553
Fair Value, Inputs, Level 1 [Member] \| Certificates of Deposit [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Securities	0
Fair Value, Inputs, Level 1 [Member] \| US Treasury and Government [Member]
Securities	125,005
Fair Value, Inputs, Level 1 [Member] \| Residential Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Collateralized Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Securities		76,553
Fair Value, Inputs, Level 2 [Member]
Securities	7,629	9,141
Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member]
Securities	1,240	2,728
Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Securities	390
Fair Value, Inputs, Level 2 [Member] \| US Treasury and Government [Member]
Securities	0
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage-Backed Securities [Member]
Securities	4,538	4,833
Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage-Backed Securities [Member]
Securities	1,461	1,580
Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member]
Securities		0
Fair Value, Inputs, Level 3 [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Certificates of Deposit [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Securities	0
Fair Value, Inputs, Level 3 [Member] \| US Treasury and Government [Member]
Securities	0
Fair Value, Inputs, Level 3 [Member] \| Residential Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Collateralized Mortgage-Backed Securities [Member]
Securities	$ 0	0
Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member]
Securities		$ 0