Note 14 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Dec. 31, 2021 USD ($)
One-to-Four Family Residential Real Estate [Member]
Foreclosed assets	$ 725
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	267
Fair Value, Inputs, Level 1 [Member] | One-to-Four Family Residential Real Estate [Member]
Foreclosed assets	0
Fair Value, Inputs, Level 1 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	0
Fair Value, Inputs, Level 2 [Member] | One-to-Four Family Residential Real Estate [Member]
Foreclosed assets	0
Fair Value, Inputs, Level 2 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	0
Fair Value, Inputs, Level 3 [Member] | One-to-Four Family Residential Real Estate [Member]
Foreclosed assets	725
Fair Value, Inputs, Level 3 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	$ 267