Note 9 - Stock Incentive Plan (Details Textual) - USD ($)		3 Months Ended			6 Months Ended			12 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Awards [Member]
Share-Based Payment Arrangement, Expense	[1]							$ 830,000	$ 581,000
Stock Awards [Member] | Awards granted in 2022 [Member]
Share-Based Payment Arrangement, Expense									$ 600,000	$ 600,000
Minimum [Member]
Decline of Book Value Per Share		15.00%	15.00%	15.00%	10.00%	10.00%	10.00%
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			1,473,324

[1] The awards issued during the year ended December 31, 2023 were granted with respect to service performed in 2022. Approximately $600,000 of compensation expense related to the 2023 awards was accrued and recognized in 2022. The awards issued during the year ended December 31, 2022 were granted with respect to service performed in 2021. Approximately $600,000 of compensation expense related to the 2022 awards was accrued and recognized in 2021.