Note 12 - Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 13,147		$ 10,290
Interest-bearing deposits	120,725		76,881
Investments in subsidiaries	189,667		183,056
Other assets	17,688		14,459
Total assets	1,519,673		1,321,837
Liabilities and Stockholders’ Equity
Other liabilities	21,867		18,214
Stockholders’ equity	200,607	$ 202,194	183,726	$ 190,238	$ 184,896
Total liabilities and stockholders’ equity	1,519,673		1,321,837
Parent Company [Member]
Assets
Cash and due from banks	987		57
Interest-bearing deposits	10,027		623
Refundable income taxes	446		423
Other assets	791		880
Total assets	201,918		185,039
Liabilities and Stockholders’ Equity
Other liabilities	1,311		1,313
Stockholders’ equity	200,607		183,726
Total liabilities and stockholders’ equity	$ 201,918		$ 185,039