Note 8 - Equity (Details) $ / shares in Units, $ in Millions		1 Months Ended		12 Months Ended
	Feb. 08, 2017 shares	Dec. 31, 2019 USD ($) employee $ / shares shares	Aug. 31, 2016 employee $ / shares shares	Dec. 31, 2019 USD ($) employee $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
EQUITY
Common units							8,000,000
Preferred units							4,538,836
Common stock, shares authorized (in shares)		260,000,000		260,000,000	260,000,000
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
Fair value of awards | $				$ 0.8
Unrecognized compensation cost | $					$ 2.1		$ 0.3
Restricted Stock
EQUITY
Compensation costs | $				4.1	$ 2.6	$ 0.7
Vesting period		6 months
Unrecognized compensation cost | $		$ 4.5		$ 4.5
Weighted-average period		1 year		1 year 7 months 6 days
Number of executives | employee		14		14
Unvested restricted stock		1,628,241		1,628,241	966,134	471,017
Incremental compensation costs associated with modifications | $		$ 0.8
Granted		22,000		889,908	528,683
Restricted Stock | Executives and Employees
EQUITY
Unvested restricted stock		1,400,000		1,400,000
Restricted Stock | Minimum
EQUITY
Vesting period				1 year
Restricted Stock | Maximum
EQUITY
Vesting period				3 years
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
IPO [Member]
EQUITY
Sale of Stock, Conversion of Each Common Unit	2.81
IPO [Member] | Conversion Of Common Units Into Common Stock [Member]
EQUITY
Stock Issued During Period, Shares, Conversion Upon Reorganization	35,262,576