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Note 10 - Concentrations of Credit Risk (Details Textual) - Debt Investments [Member] - Five Largest Debt Investments [Member]	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment Concentration Risk [Member]
Concentration Risk, Percentage	23.00%	26.00%
Investment Income Concentration Risk [Member]
Concentration Risk, Percentage	15.00%	17.00%	23.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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