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Note 5 - Income Taxes (Detail) - Changes in the Valuation Allowance (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2009 | Dec. 31, 2012 Increase Due To Uncertainty Of Recovery [Member] | Dec. 31, 2011 Increase Due To Uncertainty Of Recovery [Member] | Dec. 31, 2010 Increase Due To Uncertainty Of Recovery [Member] | Dec. 31, 2010 Decrease Related To Net Recognition Of Deferred Tax Assets [Member] | Dec. 31, 2012 Decrease Related To Utilization And Expiration [Member] | Dec. 31, 2012 Net Valuation Allowance Balance [Member] | Dec. 31, 2011 Net Valuation Allowance Balance [Member] | Dec. 31, 2010 Net Valuation Allowance Balance [Member]
Balance at beginning of year |  | $ (19,073) | $ (23,030) | $ (104,429) |  |  |  |  |  | $ (23,030) | $ (22,895) | $ (19,073)
Valuation Allowance, Deferred Tax Asset, Change In Amount | (88,000) | (71,000) |  |  | (3,837) | (3,822) | (2,713) | 88,069 | 3,702 |  |  |
Balance at end of year | (19,073) | (22,895) | (23,030) | (104,429) |  |  |  |  |  | (23,030) | (22,895) | (19,073)
Valuation Allowance, Deferred Tax Asset, Change In Amount | $ (88,000) | $ (71,000) |  |  | $ (3,837) | $ (3,822) | $ (2,713) | $ 88,069 | $ 3,702 |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43-49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 17 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration