Note 8 - Fair Value - Financial Assets At Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities	$ 42,048	$ 60,193
Certificates of Deposit [Member]
Securities	32,724	48,666
US States and Political Subdivisions Debt Securities [Member]
Securities	512	513
Residential Mortgage Backed Securities [Member]
Securities	6,429	8,037
Collateralized Mortgage Backed Securities [Member]
Securities	2,383	2,977
Fair Value, Inputs, Level 1 [Member]
Securities	0	0
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	0
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 2 [Member]
Securities	42,048	60,193
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Securities	32,724	48,666
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	512	513
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Securities	6,429	8,037
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Securities	2,383	2,977
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	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