Annual report pursuant to Section 13 and 15(d)

Note 7 - Concentrations (Details Textual)

v3.22.2.2
Note 7 - Concentrations (Details Textual)
12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
Property, Plant and Equipment, Net, Total $ 18,229,000 $ 4,998,000  
MEXICO      
Property, Plant and Equipment, Net, Total 4,213,000 $ 1,769,000  
Oulu, Finland [Member] | Nestor Cables [Member]      
Property, Plant and Equipment, Net, Total 6,916,000    
Keila, Estonia [Member] | Nestor Cables [Member]      
Property, Plant and Equipment, Net, Total $ 280,000    
Revenue Benchmark [Member] | Customer Concentration Risk [Member]      
Number of Major Customers 1 2 2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]      
Concentration Risk, Percentage 14.00%    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]      
Concentration Risk, Percentage   28.00% 30.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Number of Major Customers 1 1  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]      
Concentration Risk, Percentage 20.00% 17.00%