Quarterly report pursuant to Section 13 or 15(d)

Note 16 - Debt (Details Textual)

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Note 16 - Debt (Details Textual)
1 Months Ended 9 Months Ended
Aug. 05, 2024
USD ($)
Apr. 01, 2022
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2024
USD ($)
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrMember    
Loan Agreement, Nestor Cables [Member] | Senior Loans [Member]        
Debt Instrument, Face Amount     $ 2,000,000  
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%  
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%    
Long-Term Line of Credit       $ 0
Debt Instrument, Interest Rate During Period       7.81%
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio   1.2    
Debt Instrument, Covenant, Maximum Debt to Cash Flow Ratio   2    
Debt Instrument, Collateral Amount       $ 298,982,000
Revolving Credit Facility [Member] | Loan and Security Agreement With Bremer Bank, National Association [Member] | Subsequent Event [Member]        
Long-Term Line of Credit $ 0      
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio 1.2      
Debt Instrument, Covenant, Maximum Debt to Cash Flow Ratio 2