Note 8 - Income Taxes (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008
Undistributed Earnings of Foreign Subsidiaries	$ 110,000,000
Deferred Tax Assets, Valuation Allowance	(12,488,000)	(14,596,000)
Deferred Tax Assets, Tax Credit Carryforwards, Research	4,930,000	5,162,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	14,200,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	30,300,000
Unrecognized Tax Benefits	13,081,000	12,204,000	9,106,000	9,006,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	4,900,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	800,000	700,000	600,000
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority			37,000,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	1,000,000
Internal Revenue Service (IRS) [Member] | Exercised Stock Option [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	3,600,000
Internal Revenue Service (IRS) [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	10,800,000
State and Local Jurisdiction [Member] | Exercised Stock Option [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	1,400,000
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	10,300,000	14,600,000
Minimum [Member]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority			10,500,000
Exercised Stock Option [Member]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	25,300,000
Income Tax Provision [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 4,500,000