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Note 5 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
shares
Nov. 06, 2016
USD ($)
Mar. 31, 2006
shares
Nov. 30, 2004
shares
Mar. 31, 2004
shares
Capital Units, Authorized 245,000,000          
Common Stock, Shares Authorized 200,000,000 100,000,000        
Preferred Stock, Shares Authorized 20,000,000          
Common Stock, Shares, Outstanding, Ending Balance 82,022,500 83,253,588        
Preferred Stock, Shares Outstanding, Ending Balance 0          
Common Stock, Voting Rights, Votes Per Share 1          
Dividends, Common Stock, Total | $ $ 0          
Treasury Stock, Value, Acquired, Cost Method | $ $ 19,607          
Common Stock, Capital Shares Reserved for Future Issuance 7,078,916          
March 2004 Authorization [Member]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           2,000,000
The 2004-2006 Repurchase Authorization [Member]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased       5,000,000    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 279,200          
The 2016 Repurchase Authorization [Member]            
Stock Repurchase Program, Authorized Amount | $     $ 75,000      
Treasury Stock, Shares, Acquired 1,551,710          
Treasury Stock Acquired, Average Cost Per Share | $ / shares $ 12.64          
Treasury Stock, Value, Acquired, Cost Method | $ $ 19,600          
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ $ 49,500          
November 2004 Authorization [Member]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased         2,000,000  
Common Class A [Member]            
Common Stock, Shares Authorized 25,000,000 25,000,000        
Common Stock, Shares, Outstanding, Ending Balance 6,729,035 6,598,377        
Common Stock, Voting Rights, Votes Per Share 10          
Common Stock, Capital Shares Reserved for Future Issuance 1,703,064