Note 7 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Marketable Securities [Table Text Block]

	As of September 30, 2021		As of December 31, 2020
Marketable securities:
Amortized cost	$	114,194	$	114,531
Unrealized gains, net		1,134,931		592,423
Total fair value	$	1,249,125	$	706,954