Note G - Derivative Instruments (Details Textual) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Research and Development Expense [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	$ 5
Selling and Marketing Expense [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	1
General and Administrative Expense [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	1
Foreign Exchange Option [Member]
Price Risk Cash Flow Hedge Asset, at Fair Value	$ 0
Minimum [Member]
Derivative Instrument Hedging Period	30 days
Maximum [Member]
Derivative Instrument Hedging Period	1 year

Period that a derivative instrument is hedged, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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- Definition

Fair value as of the balance sheet date of all price risk derivative assets designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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