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Note 3 - Recent Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Jan. 01, 2018
Dec. 31, 2017
Inventory, net $ 18,856,000   $ 18,856,000   $ 16,986,000 $ 17,641,000
Contract assets 1,826,000   1,826,000   825,000 0
Accumulated deficit (114,738,000)   (114,738,000)   (111,421,000) $ (111,591,000)
Net revenue 21,101,000 $ 21,371,000 64,014,000 $ 60,805,000    
Cost of sales 19,899,000 20,630,000 57,847,000 58,988,000    
Gross profit 1,202,000 741,000 6,167,000 1,817,000    
Selling, general and administrative 2,942,000 3,134,000 9,261,000 10,125,000    
Severance, equipment relocation and other costs 274,000 357,000 1,088,000 2,235,000    
Operating loss (2,014,000) (2,755,000) (4,182,000) (10,579,000)    
Interest expense, net 231,000 208,000 665,000 602,000    
Other (income), net 56,000 115,000 (1,651,000) (1,663,000)    
Income before taxes (2,301,000) (3,078,000) (3,196,000) (9,518,000)    
Income tax expense 35,000 55,000 121,000 70,000    
Net loss (2,336,000) $ (3,133,000) (3,317,000) $ (9,588,000)    
Accounting Standards Update 2014-09 [Member]            
Inventory, net         (655,000)  
Contract assets         825,000  
Accumulated deficit         $ 170,000  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Inventory, net 20,397,000   20,397,000      
Contract assets 0   0      
Accumulated deficit (115,023,000)   (115,023,000)      
Net revenue 21,125,000   63,012,000      
Cost of sales 19,852,000   56,960,000      
Gross profit 1,273,000   6,052,000      
Selling, general and administrative 2,942,000   9,261,000      
Severance, equipment relocation and other costs 274,000   1,088,000      
Operating loss (1,943,000)   (4,297,000)      
Interest expense, net 231,000   665,000      
Other (income), net 56,000   (1,651,000)      
Income before taxes (2,230,000)   (3,311,000)      
Income tax expense 35,000   121,000      
Net loss (2,265,000)   (3,432,000)      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Inventory, net (1,541,000)   (1,541,000)      
Contract assets 1,826,000   1,826,000      
Accumulated deficit 285,000   285,000      
Net revenue (24,000)   1,002,000      
Cost of sales 47,000   887,000      
Gross profit (71,000)   115,000      
Selling, general and administrative 0   0      
Severance, equipment relocation and other costs 0   0      
Operating loss (71,000)   115,000      
Interest expense, net 0   0      
Other (income), net 0   0      
Income before taxes (71,000)   115,000      
Income tax expense 0   0      
Net loss $ (71,000)   $ 115,000