Note 8 - Income Taxes (Details) (USD $)	12 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Increase in Federal R&D[Member]	Dec. 31, 2013 Scenario, Forecast [Member]	Dec. 31, 2013 Internal Revenue Service (IRS) [Member] Exercised Stock Option [Member]	Dec. 31, 2013 Internal Revenue Service (IRS) [Member]	Dec. 31, 2013 State and Local Jurisdiction [Member] Exercised Stock Option [Member]	Dec. 31, 2013 State and Local Jurisdiction [Member]	Dec. 31, 2012 State and Local Jurisdiction [Member]	Dec. 31, 2013 Domestic Tax Authority [Member]	Dec. 31, 2012 Income Tax Provision [Member]	Apr. 30, 2011 Minimum [Member]
Note 8 - Income Taxes (Details) [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 141,000,000
Deferred Tax Assets, Valuation Allowance	16,739,000	12,488,000						16,700,000			12,500,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	15,600,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	30,200,000
Operating Loss Carryforwards										25,100,000		14,600,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	8,303,000	4,930,000			1,700,000		3,600,000	14,400,000	1,400,000	12,400,000
Unrecognized Tax Benefits	14,922,000	13,081,000	12,204,000	9,106,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	5,000,000												4,900,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	800,000	800,000
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(333,000)					1,200,000
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority														$ 10,500,000