Note 6 - Stock in Financial Institutions (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Cost Method Investments	$ 4,016,761	$ 3,910,361

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

No definition available.

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