Note 1 - Organization and Operations (Details Textual) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares	Oct. 12, 2007
Number of Reportable Segments		2
Preferred Stock, Shares Authorized		9,333,333	9,333,333
Common Class A [Member]
Number of Shares Issued Per Each Non Voting Membership Unit Upon Reorganization	4.6666667
Common Stock Voting Rights Per Share	1
Stock Issued During Period, Shares, New Issues	16,668,000
Shares Issued, Price Per Share | $ / shares	$ 16
Proceeds from Issuance of Common Stock | $	$ 245.2
Common Stock, Shares Authorized		140,000,000	30,000,000
Common Stock, Par or Stated Value Per Share | $ / shares		$ 0.01	$ 0.01
Common Class B [Member]
Number of Shares Issued Per Each Non Voting Membership Unit Upon Reorganization	4.6666667
Common Stock Voting Rights Per Share	5
Common Stock, Shares Authorized		35,000,000	0
Common Stock, Par or Stated Value Per Share | $ / shares		$ 0.01	$ 0.01
New Mountain Lake Holdings, LLC [Member]
Ownership Percentage				100.00%