Note 4 - Investments (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Investment [Table Text Block]

	December 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)	$	1,000	$	1,000	$	3,086	$	3,122
Investment in limited partnership (2)		2,183		2,183		1,280		1,280
Total investments	$	3,183	$	3,183	$	4,366	$	4,402

	December 31, 2024
			Gross		Gross
	Amortized		Unrealized		Unrealized
	Costs		Gains		Losses		Fair Value
U.S. government and agency securities, held-to-maturity	$	1,000	$	-	$	-	$	1,000

	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		1,000		100.0	%	$	1,000		100.0	%
Due after one year through five years		-		-	%		-		-	%
Due after five years through ten years		-		-	%		-		-	%
Due after ten years		-		-	%		-		-	%
Total	$	1,000		100.0	%	$	1,000		100.0	%

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

	December 31, 2024
							Total		Carrying
	Level 1		Level 2		Level 3		Fair Value		Value
U.S. government and agency securities, held-to-maturity	$	-	$	1,000	$	-	$	1,000	$	1,000

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

Investment Income [Table Text Block]

	For the Year Ended
	December 31, 2024		December 31, 2023
Interest on:
Cash equivalents	$	337	$	266
Fixed income securities		102		194
Dividends on investment in HC Series B Stock		256		1,025
Change in NAV of investment in limited partnership		363		280
Net investment income	$	1,058	$	1,765