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Note 10 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Clever Container [Member]        
Noncontrolling Interest, Ownership Percentage by Parent 28.50%   28.50%  
John H Schwan And Stephen M Merrick [Member] | Clever Container [Member]        
Ownership Percentage 50.00%   50.00%  
Schwan Incorporated [Member]        
Related Party Transaction, Amounts of Transaction $ 11,000 $ 259,000 $ 74,000 $ 442,000
Due to Related Parties, Noncurrent, Total $ 1,379,000 $ 1,199,000 $ 1,379,000 $ 1,199,000