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Note 22 - Stock-based Compensation (Details Textual) - USD ($)			3 Months Ended		12 Months Ended
	Feb. 26, 2021	Jul. 27, 2020	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Based Compensation [Line Items]
Share-based compensation arrangement by share-based payment award, stock options, expected to vest					373,258
Options exercised					44,581
Stock option exercises						$ 29,000,000
Weighted-average fair value of options granted						$ 1.50	$ 1.73
Weighted-average volatility						98.00%	90.00%
Weighted-average expected dividend yield						0.00%	0.00%
Other Operating Expense (Income) [Member]
Stock Based Compensation [Line Items]
Income recognized in excess of stock compensation expense for individual grant					$ 1,000,000.0
Restricted Stock Units and Restricted Stock Awards [Member]
Stock Based Compensation [Line Items]
Weighted average grant date fair value					$ 8.50	$ 2.91	$ 2.93
Fair value of restricted stock units and awards vested					$ 6,000,000	$ 2,000,000	$ 2,000,000
Number of Restricted Units/Awards, Granted					1,112,741
Employee Stock Option [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period					7 years
Allocated Share-based Compensation Expense					$ 2,000,000	$ 14,000,000	$ 5,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					$ 1,000,000.0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 2 months 12 days
Share-based compensation arrangement by share-based payment award, stock options, grants		2,400,000			0
Share-based compensation arrangement by share-based payment award, stock options, vested				1,800,000
Share-based compensation arrangement by share-based payment award, award vesting, percentage				100.00%
Share-based compensation arrangement by share-based payment award, accelerated vesting, number				1,800,000
Share-based compensation arrangement by share-based payment award, stock options, expected to vest		600,000
Options exercised						2,000,000.0	0
Stock issued during period shares stock options exercised during period previously been forfeited				300,000		300,000
Refund of withholding taxes on behalf of ex-employees					$ 2,000,000.0
Amount recovered from ex-employees			$ 3,600,000
Compensation expense associated with stock options exercised by ex-employees been forfeited				$ 5,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)						$ 5.86	$ 1.73
Stock options granted		2,400,000			0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value					$ 2,000,000	$ 13,000,000	$ 7,000,000
Employee Stock Option [Member] \| Lattice Based Valuation
Stock Based Compensation [Line Items]
Weighted-average fair value of options granted		$ 6.57
Range of risk-free interest rates		0.11%
Range of risk-free interest rates		0.30%
Weighted-average term		5 years 6 months 25 days
Weighted-average volatility		98.00%
Weighted-average expected dividend yield		0.00%
Employee Stock Option [Member] \| Selling, General and Administrative Expenses [Member]
Stock Based Compensation [Line Items]
Compensation expense associated with cash received for erroneous grants and refund of tax withholding			$ 4,600,000
Employee Stock Option [Member] \| Awarded on July 27, 2020 [Member] \| Selling, General and Administrative Expenses [Member]
Stock Based Compensation [Line Items]
Allocated Share-based Compensation Expense						12,600,000
Employee Stock Option [Member] \| Maximum [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Stock option exercises					$ 1,000,000
Employee Stock Option [Member] \| Minimum [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					2 years
Omnibus Incentive Plan 2013 [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Share-based Compensation Arrangement By Share-based Payment Award, Number Of Shares Registered for Issuance					13,500,000
Share-based compensation arrangement by share-based payment award shares available for grant description					For stock option grants awarded on or prior to May 19, 2021, for the number of shares available for grant under the 2013 Plan, a stock option counted as a fraction of a share, based on the fair market value of the stock option relative to the closing stock price on the date of grant.
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Fair Value of Awards Per Non-Employee Director					$ 450,000
Omnibus Incentive Plan 2013 [Member] \| Maximum [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)					13,000,000.0
Omnibus Incentive Plan 2013 [Member] \| Incentive Stock Options [Member] \| Maximum [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)					2,000,000.0
Omnibus Incentive Plan 2013 [Member] \| Stock Options and Stock Appreciation Rights [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in Shares)					2,500,000
Omnibus Incentive Plan 2013 [Member] \| Unvested Restricted Stock Awards [Member]
Stock Based Compensation [Line Items]
Allocated Share-based Compensation Expense					$ 5,000,000	$ 1,000,000	$ 2,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					$ 4,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 7 months 6 days
New Employment Agreement [Member]
Stock Based Compensation [Line Items]
Maximum percentage of issued and outstanding shares of common stock ownable	4.99%
Incremental value provided in modification	$ 0
Additional compensation expense recognized	0
New Employment Agreement [Member] \| Restricted Stock Units [Member]
Stock Based Compensation [Line Items]
Allocated Share-based Compensation Expense	$ 2,000,000
New Employment Agreement [Member] \| Restricted Stock Units [Member] \| Executive Chairman And Chief Executive Officer
Stock Based Compensation [Line Items]
Number of Restricted Units/Awards, Granted	200,000