Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]

Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]

Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member]

Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]

Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]

Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]

Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]

Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member]

Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]

Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]

Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]

Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]

Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member]

Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]

Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]

Note 2 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Inputs, Level 1 [Member] \| US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] \| Impaired Loans [Member] \| Fair Value, Nonrecurring [Member] \| Commercial Portfolio Segment [Member] \| Commercial Real Estate Owner Occupied [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] \| Impaired Loans [Member] \| Fair Value, Nonrecurring [Member] \| Commercial and Industrial Portfolio Segment [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] \| Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] \| Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 1 [Member] \| Derivative Financial Instruments, Assets [Member] \| Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Assets, fair value
Liabilities, fair value
Fair Value, Inputs, Level 2 [Member] \| US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, fair value	16,016	16,736
Fair Value, Inputs, Level 2 [Member] \| Impaired Loans [Member] \| Fair Value, Nonrecurring [Member] \| Commercial Portfolio Segment [Member] \| Commercial Real Estate Owner Occupied [Member]
Assets, fair value
Fair Value, Inputs, Level 2 [Member] \| Impaired Loans [Member] \| Fair Value, Nonrecurring [Member] \| Commercial and Industrial Portfolio Segment [Member]
Assets, fair value
Fair Value, Inputs, Level 2 [Member] \| Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] \| Fair Value, Recurring [Member]
Assets, fair value	96,175	88,582
Fair Value, Inputs, Level 2 [Member] \| Derivative Financial Instruments, Assets [Member] \| Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Assets, fair value	985	465
Liabilities, fair value	(985)	(465)
Fair Value, Inputs, Level 3 [Member] \| US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 3 [Member] \| Impaired Loans [Member] \| Fair Value, Nonrecurring [Member] \| Commercial Portfolio Segment [Member] \| Commercial Real Estate Owner Occupied [Member]
Assets, fair value	459	1,644
Fair Value, Inputs, Level 3 [Member] \| Impaired Loans [Member] \| Fair Value, Nonrecurring [Member] \| Commercial and Industrial Portfolio Segment [Member]
Assets, fair value	777	4,559
Fair Value, Inputs, Level 3 [Member] \| Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] \| Fair Value, Recurring [Member]
Assets, fair value
Fair Value, Inputs, Level 3 [Member] \| Derivative Financial Instruments, Assets [Member] \| Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Assets, fair value
Liabilities, fair value