Note 13 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

	As of September 30, 2021
	Level 1		Level 2		Level 3			Total
Assets:
Cash and cash equivalents	$	—	$	—	$	—		$	—
Short-term investments		—		233,642		—			233,642
Total assets	$	—	$	233,642	$	—		$	233,642
Liabilities:
Accrued warrant liability	$	—	$	—	$	(945,736	)	$	(945,736	)

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Three Months Ended			Three Months Ended
	September 30, 2021			September 30, 2020
	Accrued Warrant Liability			Accrued Warrant Liability
Beginning Balance	$	(945,736	)	$	-
Total (gains) or losses, realized and unrealized, included in earnings (1)		—			—
Issuances		—			—
Settlements		—			—
Ending Balance	$	(945,736	)	$	-