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Note 5 - Income Taxes (Details) - Income Tax Reconciliation (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Reconciliation [Abstract]      
Expected federal income taxes $ 8,571 $ 7,772 $ 6,356
Foreign tax rate differential (226) (203) (145)
U.S. tax graduated rates   11 (99)
State income taxes, net of federal benefit and state tax credits 605 552 522
Federal tax credits (217) (282) (132)
Uncertain tax positions (43) (73) 9
Deferred tax adjustment due to change in state tax law   (661)  
Recapitalization expenses 182    
Other 132 23 85
Total $ 9,004 $ 7,139 $ 6,596