Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	May 31, 2019
Common Stock, Shares, Outstanding, Ending Balance	12,532,550	12,150,918
Common Stock, Shares Authorized	75,000,000	75,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 5,100
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	530,000
Payments for Repurchase of Common Stock	$ 2,097	$ 3,089
Treasury Stock, Shares, Acquired	208,000	230,013
Stock Issued During Period, Shares, Warrants		373,437
Long Term Incentive Plan 2016 [Member]
Stock Issued During Period, Shares, New Issues		201,969
New Convertible Second Lien Notes, New 2L Notes [Member]
Debt Instrument, Convertible, Carrying Amount of Equity Component			$ 1,400
Costless Warrants Associated with Convertible Second Lien Notes [Member]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Class of Warrant or Right, Exercised During Period	150,000	920,312
Warrants and Rights Outstanding, Term	10 years	10 years
Stock Issued During Period, Shares, New Issues	150,000
Class of Warrant or Right, Outstanding		150,000