Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Basis of Presentation and Accounting Policies (Details Textual)

v3.10.0.1
Note 1 - Basis of Presentation and Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jun. 01, 2017
Dec. 31, 2016
Common Stock, Par or Stated Value Per Share $ 0.01   $ 0.01 $ 0.01  
Deferred Revenue $ 10,227 $ 9,290 $ 10,104   $ 6,953
Capitalized Interest Costs, Including Allowance for Funds Used During Construction, Total 1,000        
Impairment of Long-Lived Assets Held-for-use 3,000        
Equity Method Investment, Other than Temporary Impairment $ 1,200        
Effective Income Tax Rate Reconciliation, Percent, Total 20.10% 27.20%      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.01      
Incremental Common Shares Attributable to Conversion of Debt Securities, Total 2,183,708 4,070,500      
Restricted Stock [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 196,338        
Employee Stock Option [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 694,691        
Geographic Distribution, Domestic [Member]          
Deferred Revenue $ 6,800        
Geographic Distribution, Foreign [Member]          
Deferred Revenue $ 3,200