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Note 8 - Stock-based Compensation and Similar Arrangements (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Allocated Share-based Compensation Expense $ 1,493 $ 612    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 313,741      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 37.78      
Stock Equivalent Units Outstanding 6,671      
Stock Option Equivalent Units Outstanding 200,000      
General and Administrative Expense [Member]        
Allocated Share-based Compensation Expense $ 1,342 477    
Service Expense [Member]        
Allocated Share-based Compensation Expense 124 114    
HoldCo LTI Program [Member] | Scenario, Forecast [Member]        
Minimum Common Stock Price For Distribution     $ 56.79  
Long Term Incentive Plan 2006 [Member] | Other Long-term Liabilities [Member]        
Deferred Compensation Liability, Classified, Noncurrent 2,386     $ 1,841
Performance Shares [Member] | HoldCo LTI Program [Member]        
Allocated Share-based Compensation Expense $ 1,042 621    
Period for Weighted Average Price for Common Share 90 days      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 71,373      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 44.35      
Performance Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 19,200      
Stock Equivalent Unit Awards and Stock Option Equivalent Units [Member] | Accrued Expenses [Member]        
Deferred Compensation Share-based Arrangements, Liability, Current $ 2,225     $ 1,764
Stock Equivalent Unit Awards and Stock Option Equivalent Units [Member] | General and Administrative Expense [Member]        
Allocated Share-based Compensation Expense 667 730    
Long Term Incentive Plan 2006 [Member] | Service Expense [Member]        
Allocated Cash-based Compensation Expense $ 590 $ 1,015