XML 58 R47.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Note 9 - Concentrations of Credit Risk (Details Textual) - Debt Investments [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Investment Concentration Risk [Member] | Reported Value Measurement [Member]      
Concentration Risk, Percentage 23.00%   23.00%
Investment Concentration Risk [Member] | Estimate of Fair Value Measurement [Member]      
Concentration Risk, Percentage 23.00%   22.00%
Interest Income [Member] | Reported Value Measurement [Member]      
Concentration Risk, Percentage 16.00% 22.00%  
Interest Income [Member] | Estimate of Fair Value Measurement [Member]      
Concentration Risk, Percentage 21.00% 22.00%