Note G - Derivative Instruments (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Foreign Exchange Contract [Member]
Price Risk Cash Flow Hedge Asset, at Fair Value	$ 0	$ 0
Foreign Exchange Option [Member]
Price Risk Cash Flow Hedge Asset, at Fair Value	5,400,000	5,400,000
Foreign Exchange Forward Contracts and Put Options [Member] | Other Accounts Receivable [Member]
Derivative Assets (Liabilities), at Fair Value, Net	88,000	88,000	$ 0
Research and Development Expense [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	12,000	1,000
Selling and Marketing Expense [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,000	0
General and Administrative Expense [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2,000	0
Derivative Asset	93,000	93,000
Derivative Liability	5,000	5,000
Derivative Assets (Liabilities), at Fair Value, Net	$ 88,000	$ 88,000	$ (36,000)