Note 22 - Commitments - (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank Advances [Member]
Letters of Credit Outstanding, Amount	$ 203,100,000	$ 137,300,000
Letters of Credit Expiring January 2020 [Member]
Letters of Credit Outstanding, Amount	30,100,000
Letters of Credit of Expiring in February 2020 [Member]
Letters of Credit Outstanding, Amount	19,000,000
Letters of Credit of Expiring in March 2020 [Member]
Letters of Credit Outstanding, Amount	133,000,000
Letters of Credit of Expiring in April 2020 [Member]
Letters of Credit Outstanding, Amount	7,700,000
Letters of Credit of Expiring in August 2020 [Member]
Letters of Credit Outstanding, Amount	157,000
Letters of Credit of Expiring in October 2020 [Member]
Letters of Credit Outstanding, Amount	100,000
Letters of Credit of Expiring in November 2020 [Member]
Letters of Credit Outstanding, Amount	197,000
Letters of Credit of Expiring in December 2020 [Member]
Letters of Credit Outstanding, Amount	1,300,000
Letters of Credit of Expiring in January 2022 [Member]
Letters of Credit Outstanding, Amount	$ 11,500,000