Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Major Customer Concentration (Details Textual)

v3.20.4
Note 7 - Major Customer Concentration (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Revenue Benchmark [Member] | Customer A [Member]      
Concentration Risk, Percentage 19.00% 18.00%  
Revenue Benchmark [Member] | Customer B [Member]      
Concentration Risk, Percentage 12.00% 13.00%  
Revenue Benchmark [Member] | Customer C [Member]      
Concentration Risk, Percentage   10.00%  
Accounts Receivable [Member] | Customer A [Member]      
Concentration Risk, Percentage     13.00%
Accounts Receivable [Member] | Customer B [Member]      
Concentration Risk, Percentage 16.00%   12.00%
Accounts Receivable [Member] | Customers A and B [Member]      
Concentration Risk, Percentage     25.00%