XML 31 R20.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 01, 2017
USD ($)
Mar. 31, 2018
USD ($)
shares
Mar. 25, 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
Number of Operating Segments   1        
Goodwill and Intangible Asset Impairment, Total $ 0          
Foreign Currency Transaction Gain (Loss), Realized   $ (1,600) $ (1,300)      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   34,000 258,000      
Deferred Revenue   $ 5,900       10,400
Deferred Profit   2,914     $ 5,350 6,608
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total   (14,016)       (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      
Broadcast Microwave Services, Inc. (“BMS”) [Member]            
Proceeds from Divestiture of Businesses       $ 4,900    
Disposal Group, Including Discontinued Operation, Contingent Consideration       $ 2,500    
Non-current Other Accrued Liabilities [Member]            
Deferred Profit Recognized After Year One   $ 800       $ 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