Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Interim Consolidated Financial Statement Details (Details Textual)

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Note 3 - Interim Consolidated Financial Statement Details (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 29, 2020
Sep. 29, 2019
Mar. 31, 2019
Dec. 29, 2019
Depreciation, Total $ 1,603   $ 1,627  
Amortization of Intangible Assets, Total 1,518 $ 1,844 $ 1,844  
Goodwill, Ending Balance 18,165     $ 18,165
Dongguan Facility Closure [Member]        
Restructuring Charges, Total       5,000
Machinery and Equipment [Member]        
Capital Leased Assets, Gross, Total 2,275     2,275
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 1,084     974
Machinery and Equipment [Member] | Dongguan Facility Closure [Member]        
Depreciation, Total       31
Property, Plant and Equipment, Transfers and Changes 636      
Accumulated Depreciation, Depletion and Amortization, Write Down 636      
Machinery and Equipment [Member] | Assets Under Capital Lease [Member]        
Depreciation, Total 113     565
Building and Building Improvements [Member]        
Capital Leased Assets, Gross, Total 9,082     9,082
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 1,102     900
Building and Building Improvements [Member] | Assets Under Capital Lease [Member]        
Depreciation, Total 202     804
Furniture and Fixtures [Member]        
Capital Leased Assets, Gross, Total 307     307
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 69     52
Furniture and Fixtures [Member] | Dongguan Facility Closure [Member]        
Property, Plant and Equipment, Transfers and Changes 209      
Accumulated Depreciation, Depletion and Amortization, Write Down 209      
Furniture and Fixtures [Member] | Assets Under Capital Lease [Member]        
Depreciation, Total 17     46
Computer Equipment [Member] | Dongguan Facility Closure [Member] | Restructuring Charges Related to Write Down of Property, Plant and Equipment [Member]        
Property, Plant and Equipment, Transfers and Changes 410      
Accumulated Depreciation, Depletion and Amortization, Write Down 410      
Computer Equipment [Member] | Assets Under Capital Lease [Member]        
Capital Leased Assets, Gross, Total 91     91
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 58     $ 51
Depreciation, Total 7      
Leasehold Improvements [Member] | Dongguan Facility Closure [Member]        
Property, Plant and Equipment, Transfers and Changes 184      
Accumulated Depreciation, Depletion and Amortization, Write Down 181      
Restructuring Charges, Total $ 3