Note 8 - Deposits - Maturity Distribution for Certificate of Deposits (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
In one year or less	$ 204,253,000	$ 283,844,000
In one to two years	167,484,000	77,689,000
In two to three years	58,671,000	78,090,000
In three to four years	36,690,000	33,061,000
In four to five years	16,390,000	40,894,000
Total certificates of deposit	$ 483,488,000	$ 513,578,000