Annual report pursuant to Section 13 and 15(d)

Note 7 - Concentrations (Details Textual)

v3.24.3
Note 7 - Concentrations (Details Textual)
12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
Property, Plant and Equipment, Net $ 23,953,000 $ 21,527,000  
MEXICO      
Property, Plant and Equipment, Net 5,395,000 7,003,000  
Oulu, Finland [Member] | Nestor Cables [Member]      
Property, Plant and Equipment, Net 7,093,000 $ 6,703,000  
Keila, Estonia [Member] | Nestor Cables [Member]      
Property, Plant and Equipment, Net $ 989,000    
Revenue Benchmark [Member] | Customer Concentration Risk [Member]      
Number of Major Customers 2 1 1
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]      
Concentration Risk, Percentage 15.00% 16.00% 14.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Two [Member]      
Concentration Risk, Percentage 11.00%    
Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Number of Major Customers 3 3  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]      
Concentration Risk, Percentage 16.00% 16.00%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]      
Concentration Risk, Percentage 11.00% 13.00%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member]      
Concentration Risk, Percentage 10.00% 11.00%