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Consolidated Statements of Stockholders' Equity (Parentheticals) (Common Stock [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Stock [Member]
     
Common cash dividend $ 0.12us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 0.14us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 0.12us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember