Note 6 - Equity (Details) $ / shares in Units, $ in Millions		3 Months Ended
	Aug. 31, 2016 employee $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($)	Feb. 23, 2022 shares	Dec. 31, 2021 $ / shares shares
EQUITY
Common stock, shares authorized (in shares)		260,000,000			260,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01
Preferred stock, shares authorized (in shares)		50,000,000			50,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01
Restricted Stock Units
EQUITY
Vesting period		30 days
Performance Stock Units
EQUITY
Vesting period		30 days
Long-Term Incentive Plan LTIP
EQUITY
Authorized (in shares)				4,000,000.0
Granted (in shares)		5,200,000
Compensation costs | $		$ 1.9	$ 1.1
Long-Term Incentive Plan LTIP | Maximum
EQUITY
Common stock, shares authorized (in shares)		10,900,000
Long-Term Incentive Plan LTIP | Options
EQUITY
Granted (in shares)	937,424
Purchase price (per share) | $ / shares	$ 5.34
Expiration period	10 years
Number of executives | employee	2
Options outstanding, intrinsic value | $		$ 9.8
Long-Term Incentive Plan LTIP | Restricted Stock
EQUITY
Unrecognized compensation cost | $		$ 8.7
Weighted-average period		1 year 4 months 24 days
Long-Term Incentive Plan LTIP | Restricted Stock | Minimum | Executives and Employees
EQUITY
Vesting period		1 year
Long-Term Incentive Plan LTIP | Restricted Stock | Maximum | Executives and Employees
EQUITY
Vesting period		3 years 6 months
Long-Term Incentive Plan LTIP | Restricted Stock Units
EQUITY
Share price | $ / shares		$ 15.65
Unrecognized compensation cost | $		$ 3.7
Weighted-average period		2 years 9 months 18 days
Vesting period		3 years
Long-Term Incentive Plan LTIP | Performance Stock Units
EQUITY
Share price | $ / shares		$ 15.65
Unrecognized compensation cost | $		$ 5.2
Weighted-average period		2 years 9 months 18 days
Vesting period		3 years
Long-Term Incentive Plan LTIP | Performance Stock Units | Minimum
EQUITY
Potential earnings (as a percentage)		0.00%
Long-Term Incentive Plan LTIP | Performance Stock Units | Maximum
EQUITY
Potential earnings (as a percentage)		200.00%