Note 9 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Marketable Securities [Table Text Block]

	As of December 31, 2022		As of December 31, 2021
Marketable securities:
Amortized cost	$	87,411	$	114,159
Unrealized gains, net		510,321		1,097,580
Total fair value	$	597,732	$	1,211,739

Gain (Loss) on Securities [Table Text Block]

	Year Ended December 31,
	2022			2021		2020
(Loss)/gain on marketable securities, net	$	(315,508	)	$	505,163	$	594,753
Dividend income (included in Other income, net)		18,002			16,958		4,096