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Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Estimate of Fair Value Measurement [Member] |  |
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items] |  |
Derivative instruments | $ (1,670) | $ (947)
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments | 98,566 | 87,768
Fair Value, Inputs, Level 1 [Member] |  |
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items] |  |
Derivative instruments | (1,670) | (947)
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments | 98,566 | 87,768
Fair Value, Inputs, Level 2 [Member] |  |
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items] |  |
Derivative instruments |  |
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments |  |
Fair Value, Inputs, Level 3 [Member] |  |
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items] |  |
Derivative instruments |  |
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments |  |

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value portion of other assets. + References No definition available. + Details
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