Note 8 - Fair Value (Tables)

12 Months Ended

Dec. 31, 2025

Notes Tables

Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

			Quoted Prices		Realized Gains		Total Changes
	Total Carrying		in Active		and (Losses)		in Fair Values
	Amount in		Markets for		Included in		Included in
	Consolidated		Identical		Current Period		Current Period
	Balance Sheet		Assets		Earnings (Loss)		Earnings (Loss)
Marketable equity securities and U.S. Treasury trading securities at December 31, 2025	$	21,538,075	$	21,538,075	$	136,556	$	(11,626	)
Marketable equity securities and U.S. Treasury trading securities at December 31, 2024	$	13,370,229	$	13,370,229	$	1,063,730	$	1,029,051