Note 6 - Liability for Unpaid Losses and Loss Adjustment Expenses - Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance (Unaudited) (Details) $ in Thousands	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 ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 33,223
Short-duration Insurance Contracts, Accident Year 2011 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	263	$ 263	$ 266	$ 344	$ 321	$ 293	$ 257	$ 348	$ 262
IBNR Reserves	$ 1
Cumulative Number of Reported Claims
Cumulative Number of Reported Claims
Short-duration Insurance Contracts, Accident Year 2012 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 361	365	418	429	450	393	763	$ 702
IBNR Reserves	$ 12
Cumulative Number of Reported Claims	24
Cumulative Number of Reported Claims	24
Short-duration Insurance Contracts, Accident Year 2013 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 842	926	1,160	1,166	1,340	1,585	$ 1,218
IBNR Reserves	$ 21
Cumulative Number of Reported Claims	74
Cumulative Number of Reported Claims	74
Short-duration Insurance Contracts, Accident Year 2014 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 2,082	2,743	2,641	2,562	2,640	$ 2,589
IBNR Reserves	$ 58
Cumulative Number of Reported Claims	88
Cumulative Number of Reported Claims	88
Short-duration Insurance Contracts, Accident Year 2015 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 4,768	3,859	4,290	4,485	$ 3,703
IBNR Reserves	$ 268
Cumulative Number of Reported Claims	169
Cumulative Number of Reported Claims	169
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 3,963	3,927	4,495	$ 4,184
IBNR Reserves	$ 547
Cumulative Number of Reported Claims	240
Cumulative Number of Reported Claims	240
Short-duration Insurance Contracts, Accident Year 2017 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 7,846	7,647	$ 5,622
IBNR Reserves	$ 1,238
Cumulative Number of Reported Claims	282
Cumulative Number of Reported Claims	282
Short-duration Insurance Contracts, Accident Year 2018 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 6,523	$ 5,450
IBNR Reserves	$ 1,888
Cumulative Number of Reported Claims	364
Cumulative Number of Reported Claims	364
Short-Duration Insurance Contract, Accident Year 2019 [Member]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 6,575
IBNR Reserves	$ 4,564
Cumulative Number of Reported Claims	438
Cumulative Number of Reported Claims	438