Note 7 - Deposits - Maturity Distribution for Certificate of Deposits (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
In one year or less	$ 327,246,000	$ 360,395,000
In one to two years	139,801,000	173,512,000
In two to three years	39,801,000	82,480,000
In three to four years	25,577,000	16,019,000
In four to five years	22,690,000	22,003,000
Total certificates of deposit	$ 555,115,000	$ 654,409,000