Note 4 - Loans - PCI loans (Details) - Financial Asset Acquired with Credit Deterioration [Member] - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
PCI loans, recorded investment	$ 49,920	$ 61,247
PCI loans, unpaid principal balance	60,434	85,182
Peoples Bank of Virginia [Member]
PCI loans, recorded investment		5,071
PCI loans, unpaid principal balance		6,431
Waccamaw Bank [Member]
PCI loans, recorded investment		2,708
PCI loans, unpaid principal balance		14,277
Highlands [Member]
PCI loans, recorded investment	49,920	53,116
PCI loans, unpaid principal balance	60,434	64,096
Other Receivables [Member]
PCI loans, recorded investment		352
PCI loans, unpaid principal balance		$ 378

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration 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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

Name:	us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant