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Note 8 - Stockholders' Equity (Details) - Dividends (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dividends [Abstract]                      
Dividend amount per Class A and Class B share (in Dollars per share) $ 0.13 $ 0.13 $ 0.13 $ 0.20 [1] $ 0.10 $ 0.10 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.05
Total amount of dividend $ 3,366 $ 3,363 $ 3,356 $ 5,123 [1] $ 2,545 $ 2,583 $ 1,815 $ 1,817 $ 1,838 $ 1,851 $ 1,316
[1] In November 2012, we paid dividends of $2.5 million that had been declared in October 2012. An additional dividend payment of $2.6 million was declared and paid in December 2012 in lieu of the dividend typically declared and paid in March of the following year.