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Note 16 - Debt (Details Textual) |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 05, 2024 | Apr. 01, 2022 USD ($) | Mar. 31, 2021 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€)
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% |  |  |  |
Senior Loan Agreement [Member] |  |  |  |  |  |  |
Long-Term Debt |  |  |  | $ 2,072,000 | € 2,000,000 | $ 2,228,000 | € 2,000,000
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 |  |  |  | 6.42% |  |  |
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 |  |  |  | $ 291,656,000 |  |  |

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- Definition Interest payment cap. + References No definition available. + Details
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- Definition Additional interest penalty on debt instrument. + References No definition available. + Details
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- Definition Maximum debt to cash flow ratio required under debt instrument. + References No definition available. + Details
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- Definition Minimum debt service coverage ratio required under debt instrument. + References No definition available. + Details
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- Definition The minimum interest rate required for debt instrument. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Indicates type of variable interest rate on debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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