Note 3 - Fair Value of Financial Instruments (Q1) (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Fair Value Measurements [Abstract]

Fair Value on a Recurring Basis

	As of March 31, 2021
	Level 1		Level 2		Level 3		Total
Assets:
Short-term investments	$	—	$	264,193	$	—	$	264,193
Total assets	$	—	$	264,193	$	—	$	264,193

	As of December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Short-term investments	$	—	$	324,870	$	—	$	324,870
Total assets	$	—	$	324,870	$	—	$	324,870
Accrued warrant liability	$	—	$	—	$	—	$	—

	As of December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Short-term investments	$	-	$	324,870	$	-	$	324,870
Total assets	$	-	$	324,870	$	-	$	324,870
Liabilities:
Accrued warrant liability	$	-	$	-	$	-	$	-

	As of December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Short-term investments	$	-	$	452,301	$	-	$	452,301
Total assets	$	-	$	452,301	$	-	$	452,301
Liabilities:
Accrued warrant liability	$	-	$	-	$	6,414	$	6,414

Fair Value Unobservable Input Reconciliation

	Three Months Ended		Three Months Ended
	March 31, 2021		March 31, 2020
	Accrued Warrant Liability		Accrued Warrant Liability
Beginning Balance	$	-	$	6,414
Total (gains) or losses, realized and unrealized, included in earnings (1)		-		160,689
Settlements		-		(122,691	)
Ending Balance	$	-	$	44,412

(1) Unrealized gains or losses related to the accrued warrant liability were included as change in value of accrued warrant liability. There were no realized gains or losses for the three months ended March 31, 2021 and 2020.

	Year Ended December 31, 2020
Beginning Balance	$	6,414
Total (gains) or losses, realized and unrealized, included in earnings (1)		426,130
Settlements		(432,544	)
Balance at December 31, 2020	$	-

	Year Ended December 31, 2019
Beginning Balance	$	78,637
Total (gains) or losses, realized and unrealized, included in earnings (1)		(72,223	)
Balance at December 31, 2019	$	6,414

(1) Unrealized gains or losses related to the accrued warrant liability were included as change in value of warrant liability.