Note 13 - Commitments and Contingencies - Legal Proceedings (Details)	9 Months Ended
	Sep. 30, 2021 matter
Unasserted Claim | Minimum
Loss Contingencies [Line Items]
Minimum Number of Pending or Threatened Matters That Could Affect Our Results	1
Insurance Claims | Total primary reserves
Loss Contingencies [Line Items]
Loss Contingency, Legal Actions Commencement, Period	2 years
Insurance Claims | Pool Insurance Mortgage Insurance Product
Loss Contingencies [Line Items]
Loss Contingency, Legal Actions Commencement, Period	3 years