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Note 7 - Major Customers (Details Textual)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Customer One [Member]    
Accounts Receivable, before Allowance for Credit Loss $ 1,993,000 $ 2,871,000
Customer Two [Member]    
Accounts Receivable, before Allowance for Credit Loss $ 3,542,000 $ 3,088,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]    
Number of Major Customers 2 2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer One [Member]    
Concentration Risk, Percentage 28.00% 28.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Two [Member]    
Concentration Risk, Percentage 27.00% 28.00%