Note 10 - Stockholders' Equity and Stock-based Compensation (Details Textual) - USD ($)			1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 28, 2022	Nov. 30, 2021	Jul. 31, 2021	Jan. 31, 2021	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022	Apr. 30, 2021	Dec. 31, 2020
Proceeds from Issuance of Common Stock			$ 38,000,000	$ 45,000,000
Securities, Maximum Issuance Amount									$ 150,000,000
Payments of Stock Issuance Costs			2,300,000
Proceeds from Issuance of Common Stock, Net			$ 35,700,000
Stock Issued During Period, Value, New Issues						$ 3,955,000	$ 78,046,000
Gain (Loss) on Extinguishment of Debt, Total						(31,258,000)	$ 365,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms (Year)							1 year 6 months 18 days
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount						$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)							0
The 2020 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)							5,000,000			2,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)						5,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)						3,039,900
The 2020 Incentive Plan [Member] | Non-Employee Director [Member]
Share Based Compensation Arrangement By Share Based Payment Award, Maximum Annual Compensation for Services						$ 250,000
The 2020 Incentive Plan [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						1 year
Stock Appreciation Rights (SARs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)							3,126,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)							$ 1.45
Accrued Cash Settled Stock Based Payments							$ 2,100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total							$ 4,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercise Price (in dollars per share)							$ 2.89
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)						4,163,762	3,018,788			0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)						$ 1.38	$ 4.58			$ 0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 3,800,000	$ 9,700,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						6,090,765	4,386,107
Share-Based Payment Arrangement, Expense						$ 4,600,000	$ 10,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Amount						5,400,000
Share-Based Payment Arrangement, Expense, Credit						$ (800,000)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms (Year)						1 year 11 months 15 days	1 year 9 months 18 days
Restricted Stock Units (RSUs) [Member] | Vested Immediately [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						823,883
Incentive Stock Options [Member] | The 2020 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent						110.00%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)						5 years
Common Shares Issued For Debt With Institutional Investor [Member]
Conversion of Stock, Shares Issued (in shares)						20,297,993
Conversion of Stock, Amount Converted						$ 15,900,000
Gain (Loss) on Extinguishment of Debt, Total						(2,800,000)
Pre-funded Warrants Under Securities Purchase Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	7,153,847
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 0.0001
Accompanying Warrants with Securities Purchase Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	16,153,847
Class of Warrant or Right, Issued (in shares)	16,153,847
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 1.31
Class of Warrant or Right, Reserved Against S-3, Amount	$ 21,200,000
Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	9,000,000
Proceeds from Issuance or Sale of Equity, Total	$ 21,000,000.0
Stock Issued During Period, Value, New Issues					$ 3,900,000
Common Stock, Value of Capital Shares Reserved for Future Issuance						$ 65,900,000
Stock in Connection With Syndicated Debt [Member]
Stock Issued During Period, Shares, New Issues (in shares)		1,690,677				24,963,451