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Note 2 - Cash, Investments, and Restricted Cash (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2011 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 Equity Shares [Member] | Dec. 31, 2012 Non-Current Investments Held Having Net Gain Position [Member] | Dec. 31, 2012 Non-Current Investments Held Having Net Loss Position [Member]
Long-term Investments |  | $ 3,923,000 | $ 9,614,000 | $ 3,923,000 |  |  |  |  |
Tax Basis of Investments, Cost for Income Tax Purposes |  | 3,500,000 | 8,100,000 | 3,500,000 |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  | 100,000 | 1,171,000 | 140,000 | 739,000 |  | 1,200,000 |  |
Payments to Acquire Investments |  |  | 5,823,000 |  |  |  |  |  |
Cost Basis Of Short Term Investments | 800,000 |  |  |  |  |  |  |  |
Proceeds from Sale of Short-term Investments | 1,400,000 |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Investments | 600,000 |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | 835,000 | 2,059,000 | 835,000 | 1,462,000 | 744,000 |  | 1,600,000 | 137,000,000
Restricted Investments |  | $ 900,000 | $ 900,000 | $ 900,000 |  |  |  |  |

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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