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12. Segments, Products and Customers (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Total sales $ 24,615 $ 28,742
Percentage of sales 100.00% 100.00%
Drinkable Kefir other than ProBugs[Member]    
Total sales $ 18,886 $ 21,663
Percentage of sales 77.00% 76.00%
Cheese [Member]    
Total sales $ 2,851 $ 2,934
Percentage of sales 12.00% 10.00%
Cream and other [Member]    
Total sales $ 1,301 $ 1,492
Percentage of sales 5.00% 5.00%
ProBugs Kefer [Member]    
Total sales $ 763 $ 952
Percentage of sales 3.00% 3.00%
Other Dairy [Member]    
Total sales $ 479 $ 1,337
Percentage of sales 2.00% 5.00%
Frozen Kefir [Member]    
Total sales [1] $ 335 $ 364
Percentage of sales [1] 1.00% 1.00%
[1] Includes Lifeway Kefir Shop sales