Note 3- Loans and Allowance for Loan Losses - Activity for Troubled Debt Restructurings (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	$ 13,590,000	$ 2,989,000
Charge-Offs	0	(230,000)
Payments	(1,656,000)	(882,000)
Transfers to ORE	0	0
Net Additions/Deletions	3,138,000	105,000
Ending Balance	15,072,000	1,982,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	0	383,000
Charge-Offs	0	0
Payments	0	(45,000)
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	0	338,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	2,682,000	1,599,000
Charge-Offs	0	0
Payments	(39,000)	(855,000)
Transfers to ORE	0	0
Net Additions/Deletions	70,000	3,804,000
Ending Balance	2,713,000	4,548,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	0	0
Charge-Offs	0	0
Payments	0	0
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	0	0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Beginning Balance	0	0
Charge-Offs	0	0
Payments	0	0
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	548,000	1,001,000
Charge-Offs	0	(275,000)
Payments	(10,000)	(10,000)
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	538,000	716,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	0	0
Charge-Offs	0	0
Payments	0	0
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	418,000	427,000
Charge-Offs	0	0
Payments	(9,000)	(17,000)
Transfers to ORE	(97,000)	0
Net Additions/Deletions	670,000	1,597,000
Ending Balance	982,000	2,007,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	210,000	237,000
Charge-Offs	0	0
Payments	(21,000)	(5,000)
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	189,000	232,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Beginning Balance	24,000	41,000
Charge-Offs	0	0
Payments	(3,000)	(5,000)
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	21,000	36,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Beginning Balance	938,000	1,127,000
Charge-Offs	0	0
Payments	(23,000)	(8,000)
Transfers to ORE	0	0
Net Additions/Deletions	0	50,000
Ending Balance	915,000	1,169,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	142,000	146,000
Charge-Offs	0	0
Payments	(1,000)	(2,000)
Transfers to ORE	0	0
Net Additions/Deletions	0	0
Ending Balance	141,000	144,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Beginning Balance	464,000	219,000
Charge-Offs	0	(15,000)
Payments	(5,000)	(1,000)
Transfers to ORE	0	(82,000)
Net Additions/Deletions	70,000	119,000
Ending Balance	529,000	240,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	436,000	393,000
Charge-Offs	0	0
Payments	(10,000)	(9,000)
Transfers to ORE	0	0
Net Additions/Deletions	32,000	0
Ending Balance	$ 458,000	$ 384,000