Note 5 - Equity (Details Textual) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
Stock Issued During Period, Shares, New Issues		42,500
Treasury Stock, Shares, Acquired		75,053
Long Term Incentive Plan 2016 [Member]
Stock Issued During Period, Shares, New Issues		201,969
Costless Warrants Associated with Convertible Second Lien Notes [Member]
Class of Warrant or Right, Exercised During Period	0	589,375
Warrants and Rights Outstanding, Term	10 years	10 years
Class of Warrant or Right, Outstanding	150,000
Common Stock, Par or Stated Value Per Share		$ 0.01