Quarterly report [Sections 13 or 15(d)]

Note 16 - Debt (Details Textual)

v3.25.1
Note 16 - Debt (Details Textual)
1 Months Ended 6 Months Ended
Aug. 05, 2024
Apr. 01, 2022
USD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2025
EUR (€)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
EUR (€)
Sep. 30, 2024
USD ($)
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrMember          
Bank Overdrafts, Maximum Allowed | €       € 2,000,000      
Bank Overdrafts, Basis Spread on Variable Rate       1.15%      
Bank Overdrafts       € 1,144,000 $ 1,239,000 € 0 $ 0
Loan Agreement, Nestor Cables [Member] | Senior Loans [Member]              
Debt Instrument, Face Amount | €     € 2,000,000,000,000        
Debt Instrument, Term (Year)     3 years        
NESA [Member] | Senior Loans [Member]              
Debt Instrument, Covenant, Interest Payment Cap     5.00%        
Debt Instrument, Covenant, Interest Penalty     2.00%        
Senior Loan Agreement [Member]              
Long-Term Debt       € 2,000,000 2,165,000 € 2,000,000 2,228,000
Revolving Credit Facility [Member] | Loan and Security Agreement With Bremer Bank, National Association [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 40,000,000          
Debt Instrument, Basis Spread on Variable Rate   1.85%          
Debt Instrument, Minimum Interest Rate Required   1.80%          
Debt Instrument, Interest Rate During Period       6.17%      
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio 1.2 1.2          
Debt Instrument, Covenant, Maximum Debt to Cash Flow Ratio 2 2          
Debt Instrument, Collateral Amount         270,783,000    
Long-Term Line of Credit         $ 0   $ 0