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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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Gross number of share options (or share units) granted during the period.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Note 10 - Stock-based Compensation (Details Textual) - USD ($)						12 Months Ended
	May 03, 2021	Feb. 08, 2021	Mar. 25, 2020	Apr. 01, 2019	Feb. 25, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2021	Jul. 31, 2021	Jul. 31, 2020	May 31, 2017	Dec. 31, 2013
Share-based Payment Arrangement, Expense						$ 13,956,000	$ 5,981,000	$ 3,043,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)						3 years 2 months 26 days
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						624,531	844,455	1,570,455
Share-based Payment Arrangement, Expense						$ 25,000	$ 119,000	$ 370,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value						21,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value						21,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value						$ 6,900,000	$ 13,100,000	$ 7,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)						0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)						3 years 2 months 12 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						0	686,001	737,497
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)						1,212,783	930,854	429,399
Share-based Payment Arrangement, Expense						$ 12,700,000	$ 3,000,000.0	$ 1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)						801,484	717,267
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value						$ 37,800,000	$ 15,300,000	5,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value						$ 15,900,000	$ 4,500,000	$ 1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 47.20	$ 20.88
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 38,900,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)						378,502	208,858
Restricted Stock [Member] \| Executive Officer [Member]
Share-based Payment Arrangement, Expense						$ 666,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			34,154
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)			$ 9.18
Performance-based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)						0	0	0
Share-based Payment Arrangement, Expense						$ 0	$ 760,000	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			82,805			0	82,805
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)			$ 9.18			$ 0	$ 9.18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Aggregate Fair Value						$ 0	$ 760,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested						$ 0	$ 2,300,000	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)						(0)	82,805
Market-based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)						139,756	224,774	123,851
Share-based Payment Arrangement, Expense							$ 2,100,000	$ 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	6,415	115,634	109,140	29,604	94,247	152,665	109,140
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)						$ 32.50	$ 10.95
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 1,300,000				$ 834,000					$ 1,400,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Aggregate Fair Value						$ 1,800,000	$ 1,200,000	3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested						$ 10,200,000	$ 0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		231,268				231,268	(0)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	68.00%	68.00%	78.00%	69.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0.20%	0.10%	0.30%	2.50%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	2 years	2 years	2 years	2 years
Market-based Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards	200.00%	200.00%	200.00%	200.00%
Market-based Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards	0.00%	0.00%	0.00%
Market-based Restricted Stock [Member] \| Executive Officer [Member]
Share-based Payment Arrangement, Expense						$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		30,616
Market-based Restricted Stock First Issuance [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total							$ 3,100,000
Market-based Restricted Stock Second Issuance [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 1,200,000
The 2013 Performance Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)												6,500,000	5,000,000.0	4,100,000	3,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						589,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)						1,400,000
All Other Unapproved Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						36,000
Management Performance Bonus Plan 2017 [Member] \| Performance Shares [Member]
Share-based Payment Arrangement, Expense						$ 0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value						$ 27,400,000	$ 1,300,000	$ 3,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)						0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)										1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share)										$ 1.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)									999,997	999,997