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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 30, 2018
USD ($)
Oct. 01, 2018
USD ($)
Sep. 28, 2019
USD ($)
shares
Sep. 29, 2018
USD ($)
shares
Sep. 28, 2019
USD ($)
shares
Sep. 29, 2018
USD ($)
shares
Dec. 29, 2018
USD ($)
Number of VIEs Consolidated     1   1    
Accounts Receivable, Allowance for Credit Loss, Current     $ 200   $ 200   $ 300
Number of Operating Segments         4    
Number of Reportable Segments         2    
Goodwill and Intangible Asset Impairment, Total   $ 0          
Amortization of Debt Issuance Costs and Discounts, Total     300 $ 0 $ 826 $ 0  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax     $ 1,600 $ (200) $ 1,300 $ 1,200  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     459,000 0 487,000 12,000  
Revenue, Remaining Performance Obligation, Amount     $ 12,200   $ 12,200    
Accounts Receivable, Credit Loss Expense (Reversal)         0    
Contract with Customer, Liability, Total     0   0    
Contract with Customer, Liability, Current     16,200   16,200   10,800
Deferred Profit     7,952   7,952   6,896
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total     (40,260)   (40,260)   (25,880)
Assets, Total     1,071,609   1,071,609   1,134,002 [1]
Accounting Standards Update 2016-02 [Member]              
Lease Assets $ 30,700            
Lease Liabilities 29,900            
Cumulative Effect on Retained Earnings, Net of Tax, Total 10,200            
Assets, Total (500)            
Liabilities, Total $ (600)            
Non-current Other Accrued Liabilities [Member]              
Deferred Profit Recognized After Year One     $ 5,800   $ 5,800   $ 2,000
Minimum [Member]              
Standard Product Warranty Term         1 year    
Maximum [Member]              
Standard Product Warranty Term         3 years    
Building [Member] | Minimum [Member]              
Property, Plant and Equipment, Useful Life         30 years    
Building [Member] | Maximum [Member]              
Property, Plant and Equipment, Useful Life         40 years    
Building Improvements [Member] | Minimum [Member]              
Property, Plant and Equipment, Useful Life         5 years    
Building Improvements [Member] | Maximum [Member]              
Property, Plant and Equipment, Useful Life         15 years    
Machinery, Equipment and Software [Member] | Minimum [Member]              
Property, Plant and Equipment, Useful Life         3 years    
Machinery, Equipment and Software [Member] | Maximum [Member]              
Property, Plant and Equipment, Useful Life         10 years    
ALBS [Member]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     80.00%   80.00%    
Variable Interest Entity, Consolidated, Assets, Pledged, Total     $ 0   $ 0    
[1] Derived from December 29, 2018 audited financial statements