Note 7 - Equity (Details) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
	Aug. 31, 2016 employee $ / shares shares	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 $ / shares shares
EQUITY
Granted (in shares)		1,700,000	1,700,000
Common stock, shares authorized (in shares)		260,000,000	260,000,000	260,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)		50,000,000	50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01
Minimum | Executives and Employees
EQUITY
Vesting period			1 year
Maximum | Executives and Employees
EQUITY
Vesting period			3 years 6 months
Restricted Stock
EQUITY
Compensation costs | $		$ 1.5	$ 2.6
Unrecognized compensation cost | $		$ 9.9	$ 9.9
Weighted-average period			2 years 1 month 6 days
Stock Options
EQUITY
Granted (in shares)	937,424
Number of individuals | employee	2
Purchase price (per share) | $ / shares	$ 5.34
Expiration period	10 years