Note 9 - Equity (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2016 employee $ / shares shares	Dec. 31, 2020 USD ($) employee $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)
EQUITY
Granted (in shares)		3,200,000
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
Fair value of awards | $		$ 1.5	$ 0.8
Restricted Stock
EQUITY
Granted (in shares)		22,000
Compensation costs | $		$ 4.1	$ 4.1	$ 2.6
Unrecognized compensation cost | $		$ 6.0
Weighted-average period		1 year 10 months 24 days
Vesting period		6 months
Number of executives | employee		14
Incremental compensation costs associated with modifications | $		$ 0.8
Restricted Stock | Minimum
EQUITY
Vesting period		1 year
Restricted Stock | Maximum
EQUITY
Vesting period		3 years 6 months
Stock Options
EQUITY
Number of individuals | employee	2
Noncash Transaction, Conversion of Common Unit Options, Number of Common Stock Options	937,424
Purchase price (per share) | $ / shares	$ 5.34
Expiration period	10 years