Note 22 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Restricted Stock Unit and Award Activity

The following table summarizes information about restricted stock unit and award activity for the year ended December 31, 2021:

	Number of Restricted Stock Units/Awards		Weighted-Average Grant Date Fair Values
Outstanding on December 31, 2020		380,960	$	3.31
Granted		1,112,741	$	8.50
Vested		616,549	$	5.88
Forfeited		4,275	$	3.90
Outstanding on December 31, 2021		872,877	$	8.10

Stock Option Activity

The following table summarizes information about stock option activity for the year ended December 31, 2021:

	Shares Under Option		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value ($ millions)
Outstanding on December 31, 2020		7,724,426	$	8.10
Expired		438,538	$	22.01
Exercised		44,581	$	3.90
Forfeited		6,858	$	3.90
Outstanding on December 31, 2021		7,234,449	$	7.29	3.59	$	5
Exercisable on December 31, 2021		6,861,191	$	7.40	3.56	$	4
Expected to vest December 31, 2021		373,258	$	5.21	4.13	$	—

Valuation of Option Grants

The following inputs were used for the valuation of option grants issued in each year (there were no stock option grants issued in the year ended December 31, 2021):

	Year Ended December 31,
	2020		2019
Weighted-average fair value of options granted	$	1.50	$	1.73
Weighted-average risk-free interest rate	2.43%		2.47%
Expected option lives	3.7 years		4.5 years
Weighted-average volatility	98%		90%
Expected dividend yield	0.00%		0.00%

The following inputs were used in the lattice-based valuation of the July 27, 2020 option grants:

	July 27, 2020
	Option Awards
Weighted-average fair value of options granted	$	6.57
Range of risk-free interest rates	0.11% - 0.30%
Weighted-average term	5.57 years
Weighted-average volatility	98%
Weighted-average expected dividend yield	0.00%