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Investments in affiliates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet:      
Current assets $ 10,448 $ 12,010  
Non-current assets 9,647 10,203  
Total assets 20,095 22,213  
Total liabilities (5,632) (6,876)  
Total shareholders' equity 13,935 14,459  
Operating results:      
Operating income (1,701) (440) $ (1,059)
Net income 769 (146) $ 88
Blue Sky      
Balance Sheet:      
Current assets 44,918 41,614  
Non-current assets 15,258 15,666  
Total assets 60,176 57,280  
Total liabilities (30,889) (31,108)  
Total shareholders' equity 29,287 26,172  
Operating results:      
Net sales 43,933 40,348  
Operating income 2,214 677  
Net income $ 1,946 $ 704