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Note 2 - Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Dec. 31, 2017
Percentage of Revenue Out of Scope of ASU 2014-09   73.00%  
Cumulative Effect of New Accounting Principle in Period of Adoption    
Tax Cuts and Jobs Act of 2017, Reclassification From Aoci to Retained Earnings    
Operating Leases, Future Minimum Payments Due, Total     17,500
Retained Earnings [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption     (142)
Tax Cuts and Jobs Act of 2017, Reclassification From Aoci to Retained Earnings   3,625  
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption $ (142)    
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]      
Tax Cuts and Jobs Act of 2017, Reclassification From Aoci to Retained Earnings 3,625    
AOCI Attributable to Parent [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption     $ 142
Tax Cuts and Jobs Act of 2017, Reclassification From Aoci to Retained Earnings   $ (3,625)  
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption 142    
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]      
Tax Cuts and Jobs Act of 2017, Reclassification From Aoci to Retained Earnings $ (3,625)