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Note 3 - Loans and Allowance for Loan Losses - Acquired Portfolio and the Acquisition Fair Value Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 01, 2020	Oct. 01, 2019
County Bank Corp ("County") [Member]
Loans acquired - contractual payments						$ 395,123
Nonaccretable difference						(2,928)
Expected cash flows						392,195
Accretable yield						(2,079)
Carrying balance at acquisition date						390,116
Balance	$ 1,717	$ 1,659	$ 2,004	$ 0
Merger				2,079
Accretion	(253)	(342)	(345)	(75)
Transfer from non-accretable to accretable yield	400	400
Balance	1,864	1,717	1,659	2,004
County Bank Corp ("County") [Member] | Acquired Impaired [Member]
Loans acquired - contractual payments						7,729
Nonaccretable difference						(2,928)
Expected cash flows						4,801
Accretable yield						(185)
Carrying balance at acquisition date						4,616
Balance	288	135	185	0
Merger				185
Accretion	(102)	(247)	(50)	0
Transfer from non-accretable to accretable yield	400	400
Balance	586	288	135	185
County Bank Corp ("County") [Member] | Acquired Non-Impaired [Member]
Loans acquired - contractual payments						387,394
Nonaccretable difference						0
Expected cash flows						387,394
Accretable yield						(1,894)
Carrying balance at acquisition date						$ 385,500
Balance	1,429	1,524	1,819	0
Merger				1,894
Accretion	(151)	(95)	(295)	(75)
Transfer from non-accretable to accretable yield	0	0
Balance	1,278	1,429	1,524	1,819
Community Shores Bank Corp ("Community Shores") [Member]
Loans acquired - contractual payments					$ 178,986
Nonaccretable difference					(2,719)
Expected cash flows					176,267
Accretable yield					(1,465)
Carrying balance at acquisition date					174,802
Balance	719	1,298	0
Merger			1,465
Accretion	(302)	(579)	(167)
Transfer from non-accretable to accretable yield	874
Balance	1,291	719	1,298	0
Community Shores Bank Corp ("Community Shores") [Member] | Acquired Impaired [Member]
Loans acquired - contractual payments					20,491
Nonaccretable difference					(2,719)
Expected cash flows					17,772
Accretable yield					(869)
Carrying balance at acquisition date					16,903
Balance	522	843	0
Merger			869
Accretion	(302)	(321)	(26)
Transfer from non-accretable to accretable yield	874
Balance	1,094	522	843	0
Community Shores Bank Corp ("Community Shores") [Member] | Acquired Non-Impaired [Member]
Loans acquired - contractual payments					158,495
Nonaccretable difference					0
Expected cash flows					158,495
Accretable yield					(596)
Carrying balance at acquisition date					$ 157,899
Balance	197	455	0
Merger			596
Accretion	0	(258)	(141)
Transfer from non-accretable to accretable yield	0
Balance	$ 197	$ 197	$ 455	$ 0

X

- Definition

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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