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Note 5 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	9 Months Ended	12 Months Ended
	Feb. 19, 2020	Jun. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Jan. 04, 2020
Common Stock, No Par Value (in dollars per share)			$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			1,704,905	771,000
Proceeds from Issuance of Common Stock			$ 10,400	$ 3,800
Stock Repurchase Program, Authorized Amount					$ 420,000
Stock Repurchased During Period, Shares (in shares)	14,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Stock Repurchased During Period, Price Per Share (in dollars per share)	$ 30
Stock Repurchased During Period, Value	$ 420,000
Percentage of Outstanding Shares Repurchased	32.67%
Stock Issued During Period, Value, Tender Off Payback			(420,000)
Common Stock [Member]
Stock Repurchased During Period, Price Per Share (in dollars per share)	$ 6.66
Stock Issued During Period, Value, Tender Off Payback	$ 93,240
Retained Earnings [Member]
Stock Repurchased During Period, Price Per Share (in dollars per share)	$ 23.34
Stock Issued During Period, Value, Tender Off Payback	$ (326,760)		$ (326,760)
Minimum [Member]
Shares Issued, Price Per Share (in dollars per share)			$ 2.71	$ 2.50
Stock Repurchase Program, Purchase Price Per Share (in dollars per share)					$ 30.00
Maximum [Member]
Shares Issued, Price Per Share (in dollars per share)			$ 19.09	$ 15.00
Stock Repurchase Program, Purchase Price Per Share (in dollars per share)					$ 33.00
Equity Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)		4,800,000
Shares Issued, Price Per Share (in dollars per share)		$ 8.25
Proceeds from Issuance of Common Stock, Net		$ 37,500
Underwriter's Commission Attributable to Issuance of Common Stock		2,300
Other Related Fee Attributable to Issuance of Common Stock		$ 200

X

- Definition

Face amount per share of no-par value common stock.

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Face amount or stated value per share of common stock.

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The cash inflow from the additional capital contribution to the entity.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Number of share options (or share units) exercised during the current period.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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The cash inflow from the additional capital contribution to the entity, net of issuance costs.

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- Definition

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- Definition

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