Note 6 - Dividends (Details Textual) - USD ($)			12 Months Ended
Apr. 12, 2018	Mar. 22, 2018	Dec. 31, 2019	Dec. 31, 2018
Dividends Payable, Amount Per Share		$ 0.12	$ 0
Dividends Payable, Date of Record		Apr. 05, 2018
Payments of Ordinary Dividends, Common Stock	$ 233,099		$ 0	$ 233,099

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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