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Note 11 - Losses and Loss Adjustment Expenses Historical Claims Duration (Details) - Property, Liability and Casualty Insurance Product Line [Member]
Dec. 31, 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 6.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 33.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 31.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 14.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 2.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 1.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 1.70%