Note 9 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Incurred Losses and Allocated Loss Adjustment Expenses on Special Property Insurance (Details) - Special Property Product Line [Member] $ in Thousands		Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Insurance contracts, claim expense	[1]	$ 15,978
Insurance contracts, incurred but not reported liabilities	[1]	$ 8,984
Insurance contracts, number of claims	[1]	105
Insurance contracts, claims paid and allocated claim adjustment expense	[1]	$ 2,674
Reserve for losses and loss adjustment expense, net of reinsurance	[1]	13,304
Short-Duration Insurance Contract, Prior Accident Years [Member]
Insurance contracts, claim expense		46	$ 35	$ 109
Insurance contracts, incurred but not reported liabilities		$ 0
Insurance contracts, number of claims		6
Insurance contracts, claims paid and allocated claim adjustment expense		$ 46	35	109
Short-Duration Insurance Contract, Accident Year 2021 [Member]
Insurance contracts, claim expense	[1]	2,172	1,641	2,138
Insurance contracts, incurred but not reported liabilities	[1]	$ 797
Insurance contracts, number of claims	[1]	19
Insurance contracts, claims paid and allocated claim adjustment expense	[1]	$ 653	347	$ 141
Short-Duration Insurance Contract, Accident Year 2022 [Member]
Insurance contracts, claim expense	[1]	8,755	7,160
Insurance contracts, incurred but not reported liabilities	[1]	$ 4,132
Insurance contracts, number of claims	[1]	52
Insurance contracts, claims paid and allocated claim adjustment expense	[1]	$ 1,603	$ 746
Short-Duration Insurance Contract, Accident Year 2023 [Member]
Insurance contracts, claim expense		5,005
Insurance contracts, incurred but not reported liabilities		$ 4,055
Insurance contracts, number of claims		28
Insurance contracts, claims paid and allocated claim adjustment expense		$ 372

[1] Reflects the Company’s share of Loss and Loss Adjustment Expense related to non-proportional assumed reinsurance business. This amount reflects gross and net reserves related to this treaty and the ultimate incurred amount reflects IBNR only. The Company does not have direct access to individual claim information underlying the assumed quota arrangement. The Company does not use claim frequency information in the determination of loss reserves or for other internal purposes. Based on these considerations, the Company does not believe providing claims frequency information is practicable as it relates to this line of business.