Note 1 - Business Description (Details Textual) $ in Thousands	102 Months Ended
	Jan. 10, 2020	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Assets, Total		$ 3,664,299	$ 3,350,072
Loans Held for Investment and Held for Sale, Gross		2,800,000
Deposits, Total		2,821,293	2,635,128
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance		$ 435,668	$ 428,488	$ 407,993	$ 407,690
Number of Businesses Acquired	6