Note 15 - Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Securities, available-for-sale	$ 143,918		$ 144,010
US Treasury Securities [Member]
Securities, available-for-sale	1,256
US Treasury Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	1,256
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	1,256
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	10,532		19,513
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	10,532	$ 19,513
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	10,532	19,513
US Government-sponsored Enterprises Debt 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	63,492		57,929
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	63,492	57,929
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	63,492	57,929
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Residential Mortgage Backed Securities [Member]
Securities, available-for-sale	50,156		$ 56,311
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	50,156	56,311
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	50,156	56,311
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	9,985	10,257
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	9,985	10,257
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Commercial Mortgage Backed Securities [Member]
Securities, available-for-sale	8,497
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	8,497
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	8,497
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale