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Investments in affiliates (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Balance Sheet:      
Current assets $ 9,450 $ 11,504  
Total assets 19,363 21,250  
Total liabilities (4,557) (6,449)  
Total shareholders' equity 13,772 13,884  
Operating results:      
Operating income / (loss) 114 771 $ (272)
Net income 369 989 $ 769
Blue Sky      
Balance Sheet:      
Current assets 54,228 42,510  
Non-current assets 13,167 15,172  
Total assets 67,395 57,682  
Total liabilities (38,582) (27,376)  
Total shareholders' equity 28,813 30,306  
Operating results:      
Net sales 59,983 51,280  
Operating income / (loss) 1,175 1,997  
Net income $ 2,346 $ 2,105