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Note 23 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Restricted Stock Unit Activity

The following table summarizes information about restricted stock unit activity for the year ended December 31, 2020:

		Number of Restricted Stock Units				Weighted-Average Grant Date Fair Values
Outstanding on December 31, 2019			721,801			$	3.25
Granted			351,909			$	2.91
Vested			692,750			$	3.05
Outstanding on December 31, 2020			380,960			$	3.31

Stock Option Activity

The following table summarizes information about stock option activity for the year ended December 31, 2020:

		Shares Under Option				Weighted Average Exercise Price Per Share				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value ($ millions)
Outstanding on December 31, 2019			6,843,079			$	10.96
Granted			2,917,456			$	5.86
Exercised			2,019,187			$	14.51
Forfeited			16,922			$	12.50
Outstanding on December 31, 2020			7,724,426			$	8.10			4.83		$	19.42
Exercisable on December 31, 2020			7,024,347			$	8.41			4.69		$	16.86
Expected to vest December 31, 2020			700,080			$	4.97			6.24		$	2.56

Valuation of Option Grants

The following inputs were used for the valuation of option grants issued in each year:

		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%

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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