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Note 13 - Leases (Details Textual) - European Headquarters Facility [Member]
$ in Millions
6 Months Ended
Oct. 09, 2015
ft²
Jun. 30, 2017
USD ($)
Mar. 01, 2017
USD ($)
Area of Real Estate Property | ft² 33,000    
Lessee Leasing Arrangements, Term of Contract 15 years    
Lessee Leasing Arrangements, Number of Renewal Terms 3    
Lessee Leasing Arrangements, Renewal Term 6 years    
Lessee Leasing Arrangements Ability to Withdraw With Penalty 6 years    
Lessee Leasing Arrangements Ability to Withdrawn Without Penalty 9 years    
Lessee Leasing Arrangements Initial Yearly Rent   $ 0.3  
Construction in Progress, Gross     $ 3.1
Deposits and Other Assets, Noncurrent [Member]      
Lessee Leasing Arrangements, Additional Tenant Improvements   $ 0.8