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Note 12 - Significant Customers (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenue Benchmark [Member]      
Number of Major Customers 1 1  
Revenue Benchmark [Member] | Customer One [Member]      
Concentration Risk, Percentage 14.00% 27.00%  
Accounts Receivable [Member]      
Number of Major Customers 1   2
Accounts Receivable [Member] | Customer One [Member]      
Concentration Risk, Percentage 13.00%   13.00%
Accounts Receivable [Member] | Customer Two [Member]      
Concentration Risk, Percentage     11.00%