Note 5 - Goodwill - Carrying Value of Goodwill (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Mar. 07, 2022	May 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Goodwill			$ 202,524	$ 12,513	$ 135,830
Balance at beginning of period			135,830	12,513	12,513
Goodwill acquired			66,694	0
Provisional period adjustments			0	0
Impairment			0	0	0
Balance at end of period			202,524	$ 12,513	135,830
Commonwealth [Member]
Goodwill	$ 67,000		66,694		0
Balance at beginning of period			0
Goodwill acquired	66,694
Balance at end of period	$ 67,000		66,694		0
Kentucky Bancshares [Member]
Goodwill			123,317		123,317
Balance at beginning of period			123,317
Goodwill acquired		$ 123,317
Provisional period adjustments		$ (14,000)
Balance at end of period			123,317		123,317
King Southern Bancorp [Member]
Goodwill			11,831		11,831
Balance at beginning of period			11,831
Balance at end of period			11,831		11,831
Austin State Bank [Member]
Goodwill			682		682
Balance at beginning of period			682
Balance at end of period			$ 682		$ 682