Note 9 - Stock Incentive Plan (Details Textual) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Sep. 30, 2023	Dec. 31, 2023
Minimum [Member]
Decline of Book Value Per Share		15.00%	10.00%
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Increase (Decrease) in Number of Awards Due to Impairment (in shares)	(14,365)
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