Note 6 - Investments - Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
US Government Agencies Debt Securities [Member]
Less than 12 months, estimated fair value	$ 7,334	$ 511
Less than 12 Months	9	0
Greater than 12 months, estimated fair value	0	0
Greater than 12 Months	0	0
Estimated fair value	7,334	511
Total, debt securities	9	0
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, estimated fair value	100
Less than 12 Months	0
Greater than 12 months, estimated fair value	0
Greater than 12 Months	0
Estimated fair value	100
Total, debt securities	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than 12 months, estimated fair value	4,741	834
Less than 12 Months	18	6
Greater than 12 months, estimated fair value	0	0
Greater than 12 Months	0	0
Estimated fair value	4,741	834
Total, debt securities	18	6
Fixed Maturities [Member]
Less than 12 months, estimated fair value	18,353	1,345
Less than 12 Months	78	6
Greater than 12 months, estimated fair value	0	0
Greater than 12 Months	0	0
Estimated fair value	18,353	1,345
Total, debt securities	78	$ 6
Asset-backed Securities [Member]
Less than 12 months, estimated fair value	128
Less than 12 Months	0
Greater than 12 months, estimated fair value	0
Greater than 12 Months	0
Estimated fair value	128
Total, debt securities	0
Corporate Debt Securities [Member]
Less than 12 months, estimated fair value	6,050
Less than 12 Months	51
Greater than 12 months, estimated fair value	0
Greater than 12 Months	0
Estimated fair value	6,050
Total, debt securities	$ 51

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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