XML 52 R39.htm IDEA: XBRL DOCUMENT v3.10.0.1
Note 5 - Capital Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 23, 2019
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Preferred Stock, Shares Outstanding, Ending Balance   0 0 0  
Common Stock, Dividends, Per Share, Declared   $ 0.24 $ 0.96 $ 0.92 $ 0.88
Treasury Stock, Shares, Acquired     1,300,000    
Treasury Stock, Value, Acquired, Cost Method     $ 150,338 $ 179,813 $ 249,760
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 371,000 $ 371,000    
Exercise or Vesting [Member]          
Common Stock, Capital Shares Reserved for Future Issuance   1,600,000 1,600,000    
Future Issuance [Member]          
Common Stock, Capital Shares Reserved for Future Issuance   6,300,000 6,300,000    
Subsequent Event [Member]          
Common Stock, Dividends, Per Share, Declared $ 0.26        
Dividends Payable, Date to be Paid Feb. 22, 2019        
Dividends Payable, Date of Record Feb. 08, 2019