Note 8 - Fair Value of Financial Instruments - Assets and Liabilities Measured On a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Securities available for sale	$ 288,231	$ 309,516
Fair Value, Recurring [Member]
Mortgage Loans Held for Sale	256	58
Total	288,487	309,574
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Mortgage Loans Held for Sale
Total
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Mortgage Loans Held for Sale	256	58
Total	281,900	301,190
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Mortgage Loans Held for Sale
Total	6,587	8,384
US Government Agencies Debt Securities [Member]
Securities available for sale	17,129	17,439
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]
Securities available for sale	17,129	17,439
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	17,129	17,439
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale
Corporate Debt Securities [Member]
Securities available for sale	22,374	12,692
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Securities available for sale	22,374	12,692
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	22,374	12,692
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale
Collateralized Mortgage Backed Securities [Member]
Securities available for sale	149,151	165,618
Collateralized Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Securities available for sale	149,151	165,618
Collateralized Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale
Collateralized Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	149,151	165,618
Collateralized Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale	99,577	113,767
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Securities available for sale	99,577	113,767
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	92,990	105,383
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	$ 6,587	$ 8,384