Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Revenue - Disaggregation of Revenue (Details)

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Note 5 - Revenue - Disaggregation of Revenue (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Total Net Sales $ 21,892,242 $ 21,480,590 $ 61,065,759 $ 55,178,369
Percent of net sales 100.00% 100.00% 100.00% 100.00%
Broadband Service Providers [Member]        
Percent of net sales 97.00% 96.00% 95.00% 95.00%
Build-to-print Customers [Member]        
Percent of net sales 3.00% 4.00% 5.00% 5.00%
UNITED STATES        
Total Net Sales $ 20,243,752 $ 19,669,143 $ 55,861,025 $ 51,232,706
Non-US [Member]        
Total Net Sales $ 1,648,490 $ 1,811,447 $ 5,204,734 $ 3,945,663