Note 4 - Segment Reporting - Concentration of Risk (Details) - Customer Concentration Risk - customer	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Insurance Written
Entity Wide Revenue, Major Customer, Number of Customers	1	0	0
Concentration Risk, Percentage	10.00%	10.00%	10.00%
Consolidated Revenue
Entity Wide Revenue, Major Customer, Number of Customers	0	0	0
Concentration Risk, Percentage	10.00%	10.00%	10.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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