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Note 10 - Segment Reporting (Details Textual)
Pure in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Number of Major Customers 0 0 0 0