Note 11 - Derivatives - Fair Value of Derivatives (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Prepaid Expenses and Other Current Assets [Member]
Derivative, notional amount		$ 48,500,000
Derivative Asset, Fair Value, Gross Asset, Total		226,980
Gain On Sale of Loans [Member]
Gain (loss) on sale of loans	(652,878)	139,435
Forward Contracts [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative, notional amount		21,500,000
Derivative Asset, Fair Value, Gross Asset, Total		(153,906)
Forward Contracts [Member] \| Gain On Sale of Loans [Member]
Gain (loss) on sale of loans	(272,012)	(58,344)
Interest Rate Lock Commitments [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative, notional amount		27,000,000
Derivative Asset, Fair Value, Gross Asset, Total		380,886
Interest Rate Lock Commitments [Member] \| Gain On Sale of Loans [Member]
Gain (loss) on sale of loans	$ (380,866)	$ 197,779

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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