Note 4 - Loans and Allowance for Loan Losses - Risk Category of Commercial Loans by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loans receivable	$ 780,053	$ 777,052
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	223,067	216,360
Commercial and Industrial Portfolio Segment [Member]
Loans receivable	100,509	113,243
Commercial Portfolio Segment [Member]
Loans receivable	323,576	329,603
Commercial Real Estate Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	58,062	61,694
Commercial Real Estate Nonowner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	128,698	117,188
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	36,307	37,478
Pass [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable	88,687	92,417
Pass [Member] | Commercial Portfolio Segment [Member]
Loans receivable	295,432	295,382
Pass [Member] | Commercial Real Estate Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	50,136	50,474
Pass [Member] | Commercial Real Estate Nonowner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	120,302	115,170
Pass [Member] | Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	36,307	37,321
Criticized [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable	1,460	6,536
Criticized [Member] | Commercial Portfolio Segment [Member]
Loans receivable	6,263	14,260
Criticized [Member] | Commercial Real Estate Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	4,803	7,724
Criticized [Member] | Commercial Real Estate Nonowner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable
Criticized [Member] | Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable
Classified [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable	10,362	14,290
Classified [Member] | Commercial Portfolio Segment [Member]
Loans receivable	21,881	19,961
Classified [Member] | Commercial Real Estate Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	3,123	3,496
Classified [Member] | Commercial Real Estate Nonowner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	8,396	2,018
Classified [Member] | Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		$ 157