Note 8 - Liability for Unpaid Losses and Loss Adjustment Expenses - Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance (Unaudited) (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 53,313
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	360	$ 360	361	365	418	429	450	393	763	702
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	74
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	74
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 826	825	842	926	1,160	1,166	1,340	1,585	1,218
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	88
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	88
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 2,034	2,035	2,082	2,743	2,641	2,562	2,640	2,589
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	169
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	169
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 4,788	4,788	4,768	3,859	4,290	4,485	3,703
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	240
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	240
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 3,834	3,833	3,963	3,927	4,495	4,184
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	282
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	282
Short-duration Insurance Contracts, Accident Year 2017 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 9,017	9,018	7,846	7,647	5,622
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	364
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	364
Short-duration Insurance Contracts, Accident Year 2018 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 8,847	8,847	6,523	5,450
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	442
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	442
Short-Duration Insurance Contract, Accident Year 2019 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 11,615	11,616	6,575
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	527
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	527
Short-Duration Insurance Contract, Accident Year 2020 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 10,512	10,512
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	444
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	444
Short-Duration Insurance Contract, Accident Year 2021 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 1,479
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	94
IBNR Reserves	$ 0
Cumulative Number of Reported Claims	94