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Note D - Financing Arrangements (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 17, 2012 | Oct. 01, 2010
Unsecured Debt | $ 5,000,000 | $ 10,000,000 |  | $ 17,000,000 | $ 35,000,000
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |  |  | 0.75%
Line of Credit Facility, Amount Outstanding | 19,300,000 | 20,000,000 |  |  |
Letters of Credit Outstanding, Amount | 5,100,000 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 4,900,000 | 5,000,000 |  |  |
Interest Expense, Debt | 122,000 | 179,000 | 175,000 |  |
Operating Leases, Rent Expense | 1.1 | 866,000 | 852,000 |  |
LIBOR Rate Spread On Unsecured Bank Loan [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.75% |
Bank Line Of Credit Maturing November 2013 [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 20,000,000 |  |  |  |
LIBOR Rate Spread On Bank Line Of Credit [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |  |  |
Bank Line Of Credit Maturing November 2012 [Member] |  |  |  |  |
Letters of Credit Outstanding, Amount | 700,000 |  |  |  |
Bank Line Of Credit Maturing May 2013 [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 10,000,000 |  |  |  |
Bank Line Of Credit Maturing May 2012 [Member] |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 5,000,000 |  |  |

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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings. + 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 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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