Note 2 - Sales/Mergers/Acquisitions - Sale of Assets and liabilities (Details) - USD ($) $ in Thousands			12 Months Ended
	Aug. 12, 2020	Nov. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Total assets sold				$ 11,966
LIABILITIES
Total liabilities sold				5,003
Gain (loss) on sale of assets and liabilities of subsidiary			$ (158)	12,286
Assets held for sale				11,966
Liabilities held for sale				5,003
Disposition costs			690	3,325
RB&T
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price premium for intangible assets		8.00%
Purchase price premium multiplied		0.345
Purchase price premium		$ 12,500
ASSETS
Cash and due from banks		3,973
Interest-bearing deposits at financial institutions		55,291
Securities held to maturity, at amortized cost		3,243
Securities available for sale, at fair value		21,874
Loans/leases receivable held for investment, net		357,931
Premises and equipment, net		5,612
Restricted investment securities		675
Other real estate owned, net		2,134
Other assets		3,228
Total assets sold		453,961
LIABILITIES
Noninterest-bearing deposits		69,802
Interest-bearing deposits		331,486
Short-term borrowings		1,158
Federal Home Loan Bank advances		15,000
Other liabilities		2,241
Total liabilities sold		419,687
Net assets sold		34,274
Note receivable consideration		46,560
Consideration received		46,600
Gain (loss) on sale of assets and liabilities of subsidiary		12,286
Assets held for sale		453,961
Liabilities held for sale		$ 419,687
Bates Companies
ASSETS
Cash and due from banks	$ 349
Premises and equipment, net	19
Other assets	2,259
Total assets sold	2,627
LIABILITIES
Other liabilities	946
Total liabilities sold	946
Net assets sold	1,681
Forgiveness of earn-out consideration	880
Cash consideration	195
Note receivable consideration	448
Consideration received	500
Imputed interest	52
Gain (loss) on sale of assets and liabilities of subsidiary	158
Assets held for sale	2,627
Liabilities held for sale	946
Disposition costs			$ 227
Bates Companies | Earnout Agreement Cancellation [Member]
LIABILITIES
Consideration received	$ 880
Asset held-for-sale
ASSETS
Total assets sold				12,000
LIABILITIES
Total liabilities sold				5,000
Assets held for sale				12,000
Liabilities held for sale				5,000
Disposition costs				$ 3,300