Note 7 - Deposits - Components of Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Noninterest-bearing demand deposits	$ 462,851	$ 454,143	[1]
Interest-bearing deposits:
Interest-bearing demand deposits	462,334	465,407
Money market accounts	156,421	170,731
Savings deposits	352,693	342,064
Certificates of deposit	350,582	374,373
Individual retirement accounts	119,857	123,173
Total interest-bearing deposits	1,441,887	1,475,748	[1]
Total deposits	$ 1,904,738	$ 1,929,891	[1]

[1] Derived from audited financial statements