Note 12 - Derivative Financial Instruments - Derivative Instruments (Details) - Interest Expense [Member] - Designated as Hedging Instrument [Member] - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest Rate Swap [Member]
Derivative gain (loss)	$ (33,424)	$ (9,423)	$ (162,517)	$ (17,261)
Interest Rate Swap - Subordinated Debentures [Member]
Derivative gain (loss)	$ 7,268		$ 8,569

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

Name:	us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration