XML 56 R46.htm IDEA: XBRL DOCUMENT v3.21.1
Note 10 - Segment Reporting (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue Benchmark [Member]      
Number of Major Customers 0 0  
Revenue Benchmark [Member] | One Customer [Member]      
Concentration Risk, Percentage 12.40%   13.30%
Accounts Receivable [Member]      
Number of Major Customers 1   1