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Note 4 - Investments (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Investment [Table Text Block]

		*March 31, 2024*								*December 31, 2023*
						*Cost/Amortized*								*Cost/Amortized*
		*Fair Value*				*Cost, Net*				*Fair Value*				*Cost, Net*
U.S. government and agency securities, held-to-maturity ⁽¹⁾		$	3,092			$	3,123			$	3,086			$	3,122
Investment in limited partnership, at net asset value ⁽²⁾			1,238				1,238				1,280				1,280
Total investments		$	4,330			$	4,361			$	4,366			$	4,402

		*March 31, 2024*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Costs*				*Gains*				*Losses*				*Fair Value*
U.S. government and agency securities, held-to-maturity		$	3,123			$	-			$	(31	)		$	3,092

		*December 31, 2023*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Costs*				*Gains*				*Losses*				*Fair Value*
U.S. government and agency securities, held-to-maturity		$	3,122			$	-			$	(36	)		$	3,086

Investments Classified by Contractual Maturity Date [Table Text Block]

		*Amortized*				*Percent of*								*Percent*
		*Cost*				*Total*				*Fair Value*				*of Total*
Due in one year or less		$	3,123				100.0	%		$	3,092				100.0	%
Total		$	3,123				100.0	%		$	3,092				100.0	%

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

		*March 31, 2024*
														*Total Fair*				*Carrying*
		*Level 1*				*Level 2*				*Level 3*				*Value*				Value ⁽¹⁾
U.S. government and agency securities, held-to-maturity		$	-			$	3,092			$	-			$	3,092			$	3,123

		*December 31, 2023*
														*Total Fair*				*Carrying*
		*Level 1*				*Level 2*				*Level 3*				*Value*				Value ⁽¹⁾
U.S. government and agency securities, held-to-maturity		$	-			$	3,086			$	-			$	3,086			$	3,122

Investment Income [Table Text Block]

		For the Three Months Ended
		March 31, 2024				March 31, 2023

Interest on:
Cash equivalents		$	103			$	63
Fixed income securities			29				38
Dividends on investment in HC Series B Stock			256				256
Change in NAV of investment in limited partnership			36				-
Less: Investment expense			(1	)			(1	)
Net investment income		$	423			$	356