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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 01, 2017
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 24, 2017
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Jun. 24, 2017
USD ($)
shares
Dec. 26, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 30, 2017
USD ($)
Allowance for Doubtful Accounts Receivable, Current, Ending Balance     $ 200   $ 200       $ 200
Number of Operating Segments         1        
Goodwill and Intangible Asset Impairment, Total $ 0                
Foreign Currency Transaction Gain (Loss), Realized     $ 3,000 $ (1,200) $ 1,500 $ (2,500)      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     3,000 46,000 19,000 152,000      
Contract with Customer, Liability, Total     $ 0 $ 0 $ 0 $ 0     0
Deferred Revenue     3,400   3,400       10,400
Deferred Profit     1,709 [1]   1,709 [1]     $ 5,350 6,608
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total     (20,708)   (20,708)       (17,787)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax         0 0      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total         0 0      
Contract with Customer, Asset, Net, Total     0 $ 0 0 $ 0     0
Broadcast Microwave Services, Inc. (“BMS”) [Member]                  
Proceeds from Divestiture of Businesses   $ 4,900         $ 4,900    
Disposal Group, Including Discontinued Operation, Contingent Consideration   $ 2,500         $ 2,500    
Non-current Other Accrued Liabilities [Member]                  
Deferred Profit Recognized After Year One     $ 1,200   $ 1,200       $ 800
Accounting Standards Update 2014-09 [Member]                  
Deferred Profit               (1,258)  
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]                  
Cumulative Effect of New Accounting Principle in Period of Adoption               $ 1,100  
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        
[1] Balance sheet line items include the cumulative-effect adjustment recorded on December 31, 2017.