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Note 9 - Commitments and Contingencies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |
Operating Leases, Rent Expense, Net | $ 1,600,000 us-gaap_OperatingLeasesRentExpenseNet | $ 2,100,000 us-gaap_OperatingLeasesRentExpenseNet | $ 2,500,000 us-gaap_OperatingLeasesRentExpenseNet
Operating Leases, Income Statement, Sublease Revenue | $ 353,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue | $ 71,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue | $ 55,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition The amount of revenue recognized for the period under subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration