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Note 16 - Concentration of Risk - Customer Concentration (Details) - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable [Member] | Customer A [Member]    
Customer 18.00% 24.00%
Accounts Receivable [Member] | Customer B [Member]    
Customer [1]   14.00%
Accounts Receivable [Member] | Customer C [Member]    
Customer 10.00%  
Revenue Benchmark [Member] | Customer A [Member]    
Customer 20.00% 20.00%
Revenue Benchmark [Member] | Customer B [Member]    
Customer 12.00% 12.00%
[1] Customer's balance was below the 10% threshold for receivables as of December 31, 2017.