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Note 3 - Restatement of Previously Reported Financial Statements (Details Textual) - USD ($)
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Dec. 31, 2018
Accounts Payable, Current, Total $ 12,301,000   $ 13,427,000
Net Income (Loss) Attributable to Parent, Total $ (3,036,000) $ (1,795,000)  
Earnings Per Share, Basic, Total $ (0.15) $ (0.09)  
Cost of Goods and Services Sold, Total $ 18,704,000 $ 17,911,000  
Earnings Per Share, Diluted, Total $ (0.15) $ (0.09)  
Restatement Adjustment [Member]      
Accounts Payable, Current, Total $ 631,000    
Net Income (Loss) Attributable to Parent, Total $ (731,000)    
Earnings Per Share, Basic, Total $ (0.04)    
Cost of Goods and Services Sold, Total $ 731,000    
Earnings Per Share, Diluted, Total $ (0.04)    
Previously Reported [Member]      
Accounts Payable, Current, Total $ 11,670,000    
Net Income (Loss) Attributable to Parent, Total $ (2,305,000)    
Earnings Per Share, Basic, Total $ (0.11)    
Cost of Goods and Services Sold, Total $ 17,973,000    
Earnings Per Share, Diluted, Total $ (0.11)    
Understatement [Member]      
Accounts Payable, Current, Total $ 786,000    
Cost of Goods and Services Sold, Total $ 786,000