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Note 5 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
shares
Nov. 06, 2016
shares
Mar. 31, 2006
shares
Nov. 30, 2004
shares
Mar. 31, 2004
shares
Capital Units, Authorized 135,000,000 135,000,000            
Common Stock, Shares Authorized 100,000,000 100,000,000   100,000,000        
Treasury Stock, Value, Acquired, Cost Method | $   $ 4,000            
Common Stock, Capital Shares Reserved for Future Issuance 6,044,746 6,044,746   5,449,148        
Common Stock, Voting Rights, Votes Per Share 1 1            
Dividends, Common Stock | $   $ 0 $ 0          
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, Remaining Number of Shares Authorized to be Repurchased       279,200        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           5,000,000    
The 2016 Repurchase Authorization [Member]                
Treasury Stock, Value, Acquired, Cost Method | $ $ 4,000              
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ $ 69,000 $ 69,000            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased         75,000,000      
Treasury Stock, Shares, Acquired 322,038              
Treasury Stock Acquired, Average Cost Per Share | $ / shares $ 12.39              
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 15,000,000 15,000,000   15,000,000        
Common Stock, Capital Shares Reserved for Future Issuance 1,923,144 1,923,144   257,581        
Common Stock, Voting Rights, Votes Per Share 10 10            
Blank Check Preferred Stock [Member]                
Preferred Stock, Shares Authorized 20,000,000 20,000,000