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Note D - Financing Arrangements (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2015
Interest Expense, Debt | $ 20,000 | $ 122,000 | $ 134,000 |
Operating Leases, Rent Expense | 1,100,000 | 1,000,000 | $ 1,100,000 |
Line of Credit Maturing November 2017 [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 20,000,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 20,000,000 | $ 20,000,000 |  |
Line of Credit Maturing November 2017 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |
Line of Credit Maturing May 2016 [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 8,000,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 3,200,000 | 3,900,000 |  |
Letters of Credit Outstanding, Amount | 4,800,000 | $ 4,100,000 |  |
Line of Credit Maturing May 2016 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |
Bank Guarantee [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 3,000,000
Line of Credit Facility, Remaining Borrowing Capacity | 600,000 |  |  |
Letters of Credit Outstanding, Amount | $ 2,400,000 |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  | 1.75%

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + 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=63488584&loc=d3e20235-122688 + Details
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