Note 10 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Gain (Loss) on Securities [Table Text Block]

	THREE MONTHS ENDED JUNE 30,					SIX MONTHS ENDED JUNE 30,
	2025		2024			2025		2024
Net gains (losses) recognized during the period on marketable securities	$	24,576	$	(9,501	)	$	36,926	$	31,995
Less: Net losses recognized on marketable securities sold during the period		-		-			1,507		-
Net unrealized gains (losses) recognized during the reporting period on marketable securities still held at the reporting date	$	24,576	$	(9,501	)	$	38,433	$	31,995

Marketable Securities [Table Text Block]

June 30, 2025 (unaudited)	Cost		Fair Value		Unrealized Gain
Equity Securities:
Equity and other mutual funds	$	643,419	$	710,829	$	67,410
Other short-term investments:
U.S. Treasury Bills (original maturities > 3 months)		5,941,815		5,941,815		-
Total marketable securities	$	6,585,234	$	6,652,644	$	67,410

December 31, 2024 (audited)	Cost		Fair Value		Unrealized Gain
Equity Securities:
Equity and other mutual funds	$	634,705	$	663,682	$	28,977
Other short-term investments:
Fixed income Certificates of Deposit (original maturities > 3 months)		570,000		570,000		-
U.S. Treasury Bills (original maturities > 3 months)		6,288,943		6,288,943		-
Total other short-term investments		6,858,943		6,858,943		-
Total marketable securities	$	7,493,648	$	7,522,625	$	28,977