Note 9 - Stock Incentive Plan (Details Textual) - USD ($) $ in Millions		3 Months Ended	6 Months Ended			12 Months Ended
		Sep. 30, 2023	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2024
Minimum [Member]
Decline of Book Value Per Share		15.00%			10.00%
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	[1]		2,393	14,365
Share-Based Compensation Arrangement by Share-Based Payment Award, Increase (Decrease) in Number of Awards Due to Impairment (in shares)						(14,365)
Performance Shares [Member] | Former Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)			2,393
Stock Awards [Member]
Share-Based Payment Arrangement, Amount Accrued			$ 0.2	$ 0.2
The 2021 Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum			10.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)			1,473,324

[1] During 2025, a participant's service as an employee of the Manager ended resulting in the forfeiture of 2,393 PUs as provided in the Plans.