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Note 8 - Stockholders' Equity (Details) - Dividends Paid (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
2012                      
Dividend amount per share $ 0.16us-gaap_CommonStockDividendsPerShareCashPaid $ 0.16us-gaap_CommonStockDividendsPerShareCashPaid $ 0.16us-gaap_CommonStockDividendsPerShareCashPaid $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid $ 0.20us-gaap_CommonStockDividendsPerShareCashPaid [1] $ 0.10us-gaap_CommonStockDividendsPerShareCashPaid $ 0.10us-gaap_CommonStockDividendsPerShareCashPaid $ 0.07us-gaap_CommonStockDividendsPerShareCashPaid
Total amount of dividend $ 4,198us-gaap_DividendsCommonStock $ 4,174us-gaap_DividendsCommonStock $ 4,179us-gaap_DividendsCommonStock $ 3,378us-gaap_DividendsCommonStock $ 3,366us-gaap_DividendsCommonStock $ 3,363us-gaap_DividendsCommonStock $ 3,356us-gaap_DividendsCommonStock $ 5,123us-gaap_DividendsCommonStock [1] $ 2,545us-gaap_DividendsCommonStock $ 2,583us-gaap_DividendsCommonStock $ 1,815us-gaap_DividendsCommonStock
[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.