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