Note 10 - Risks and Uncertainties - Summary of Payment Deferrals (Details) - Subsequent Event [Member] $ in Thousands	Apr. 21, 2020 USD ($)
Number of Loans	252
Balance	$ 147,000
Commercial Portfolio Segment [Member]
Number of Loans	188
Balance	$ 107,021
% of Total Loans	10.71%
Commercial Portfolio Segment [Member] | Residential Non-owner Occupied Loan [Member]
Number of Loans	9
Balance	$ 2,297
% of Total Loans	0.23%
Commercial Portfolio Segment [Member] | Office Loan [Member]
Number of Loans	9
Balance	$ 1,776
% of Total Loans	0.18%
Commercial Portfolio Segment [Member] | Retail Loan [Member]
Number of Loans	41
Balance	$ 52,443
% of Total Loans	5.25%
Commercial Portfolio Segment [Member] | Restaurant/food service/bar Loan [Member]
Number of Loans	8
Balance	$ 3,320
% of Total Loans	0.33%
Commercial Portfolio Segment [Member] | Hospitality and Tourism Loan [Member]
Number of Loans	8
Balance	$ 4,638
% of Total Loans	0.46%
Commercial Portfolio Segment [Member] | Other Loans [Member]
Number of Loans	113
Balance	$ 42,547
% of Total Loans	4.26%