Note 7 - Investments in Equity Securities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Gain (Loss) on Securities [Table Text Block]

					UNREALIZED			REALIZED
	BALANCE		ACQUISITIONS,		GAINS			GAINS		BALANCE
	AT		DISPOSITIONS		(LOSSES)			INCLUDED		AT END
	BEGINNING		AND		INCLUDED			IN		OF
	OF YEAR		SETTLEMENTS		IN EARNINGS			EARNINGS		PERIOD
Year ended December 31, 2021	$	1,534,400	$	19,698	$	(188,615	)	$	152,761	$	1,518,244
Year ended December 31, 2022	$	1,518,244	$	-	$	(860,273	)	$	-	$	657,971

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

	Quoted Market Prices in Attractive Markets (Level 1)		Models with Significant Observable Market Parameters (Level 2)		Unobservable Inputs that are not Corroborated by Market Data (Level 3)		Total Carrying Value in the Balance Sheet
Common stock as of December 31, 2022	$	657,971	$	-	$	-	$	657,971
Common stock as of December 31, 2021	$	1,518,244	$	-	$	-	$	1,518,244