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Note I - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Note I - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers [Line Items] |  |  |
Sales by Location (in Dollars) | $ 391,665 | $ 375,691 | $ 359,490
Percentage of Sales | 100.00% | 100.00% | 100.00%
UNITED STATES |  |  |
Note I - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers [Line Items] |  |  |
Sales by Location (in Dollars) | 257,038 | 239,153 | 241,405
Percentage of Sales | 66.00% | 64.00% | 67.00%
Foreign Countries [Member] |  |  |
Note I - Business Segment Information (Details) - Components of Customer Sales Determined Based on the Location of Customers [Line Items] |  |  |
Sales by Location (in Dollars) | $ 134,627 | $ 136,538 | $ 118,085
Percentage of Sales | 34.00% | 36.00% | 33.00%

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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