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Note 3 - Recent Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($)
 3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Jan. 01, 2018
Dec. 31, 2017
Inventory, net $ 16,579,000   $ 16,986,000 $ 17,641,000
Contract assets 1,331,000   825,000 0
Accumulated deficit (113,216,000)   (111,421,000) $ (111,591,000)
Net revenue 19,942,000 $ 18,185,000    
Cost of sales 17,911,000 18,732,000    
Gross profit 2,031,000 (547,000)    
Selling, general and administrative 3,148,000 3,410,000    
Severance, equipment relocation and other costs 509,000 998,000    
Operating loss (1,626,000) (4,977,000)    
Interest expense, net 213,000 188,000    
Other (income), net (84,000) (1,848,000)    
Loss before taxes (1,755,000) (3,317,000)    
Income tax expense 40,000 (9,000)    
Net loss (1,795,000) $ (3,308,000)    
Accounting Standards Update 2014-09 [Member]        
Inventory, net     (655,000)  
Contract assets     825,000  
Accumulated deficit     $ 170,000  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
Inventory, net 1,055,000      
Contract assets 1,331,000      
Accumulated deficit 276,000      
Net revenue 507,000      
Cost of sales 401,000      
Gross profit 106,000      
Selling, general and administrative 0      
Severance, equipment relocation and other costs 0      
Operating loss 106,000      
Interest expense, net 0      
Other (income), net 0      
Loss before taxes 106,000      
Income tax expense 0      
Net loss 106,000      
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Inventory, net 17,634,000      
Contract assets 0      
Accumulated deficit (113,492,000)      
Net revenue 19,435,000      
Cost of sales 17,510,000      
Gross profit 1,925,000      
Selling, general and administrative 3,148,000      
Severance, equipment relocation and other costs 509,000      
Operating loss (1,732,000)      
Interest expense, net 213,000      
Other (income), net (84,000)      
Loss before taxes (1,861,000)      
Income tax expense 40,000      
Net loss $ (1,901,000)