Note 6 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Marketable Securities [Table Text Block]

	As of June 30, 2021		As of December 31, 2020
Marketable securities:
Amortized cost	$	114,331	$	114,531
Unrealized gains, net		677,805		592,423
Total fair value	$	792,136	$	706,954