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Note A - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Maturities as of December 31, 2011 |  | Maturities as of December 31, 2010 |
|  | 1 Year or Less |  |  | 1 to 8 Years |  | 1 Year or Less |  | 1 to 5 Years |
Municipal bonds, U.S. Government and federal agency bonds |  | $ | — |  |  | $ | — |  | $ | — |  | $ | 16,542 |
Corporate bonds |  |  | 5,659 |  |  |  | 63,965 |  |  | 13,289 |  |  | 93,741 |
Certificates of deposit |  |  | — |  |  |  | 8,039 |  |  | — |  |  | 4,034 |
|  | $ | 5,659 |  |  | $ | 72,004 |  | $ | 13,289 |  | $ | 114,317 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration