Note 4 - Repurchase Agreements - Risks With Individual Counterparties (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Amount at risk	$ 5,800	$ 5,800
South Street Securities, LLC [Member]
Amount at risk	$ 1,392	$ 1,226
Percent of Stockholders' Equity at Risk	18.90%	18.00%
Weighted Average Maturity (Day)	21 days	23 days
Mirae Asset Securities (USA) Inc. [Member]
Amount at risk	$ 1,028	$ 842
Percent of Stockholders' Equity at Risk	13.90%	12.30%
Weighted Average Maturity (Day)	51 days	139 days
DV Securities, LLC Repo [Member]
Amount at risk	$ 936
Percent of Stockholders' Equity at Risk	12.70%
Weighted Average Maturity (Day)	21 years
Marex Capital Markets Inc [Member]
Amount at risk	$ 830	$ 1,205
Percent of Stockholders' Equity at Risk	11.30%	17.70%
Weighted Average Maturity (Day)	39 days	18 years
Mitsubishi UFJ Securities, Inc [Member]
Amount at risk	$ 829	$ 858
Percent of Stockholders' Equity at Risk	11.20%	12.60%
Weighted Average Maturity (Day)	49 days	14 days
Clear Street LLC [Member]
Amount at risk	$ 773	$ 794
Percent of Stockholders' Equity at Risk	10.50%	11.60%
Weighted Average Maturity (Day)	49 days	79 years
DV Securities, LLC. [Member]
Amount at risk		$ 834
Percent of Stockholders' Equity at Risk		12.20%
Weighted Average Maturity (Day)		28 days