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Interests in affiliates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet:      
Current assets $ 12,010 $ 13,533  
Non-current assets 10,203 9,532  
Total assets 22,213 23,065  
Total liabilities (6,876) (7,520)  
Total shareholders' equity 14,459 14,589  
Operating results:      
Operating income (440) (1,059) $ (574)
Net income (146) 88 $ 473
Blue Sky      
Balance Sheet:      
Current assets 41,614 46,925  
Non-current assets 15,666 19,450  
Total assets 57,280 66,375  
Total liabilities (31,108) (40,330)  
Total shareholders' equity 26,172 26,045  
Operating results:      
Net sales 40,348 50,165  
Operating income 677 (5,194)  
Net income $ 704 $ (4,048)