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Note 9 - Leases (Details Textual) |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2024 USD ($) | May 11, 2023 EUR (€) | Jul. 31, 2021 USD ($) ft² | Apr. 30, 2024 USD ($) | Apr. 30, 2024 EUR (€) | Sep. 30, 2024 USD ($) ft² | Sep. 30, 2024 EUR (€) ft² | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Nov. 19, 2021 ft² | Jan. 01, 2015 ft²
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  |  |  |  |  | $ 4,731,000 |  | $ 3,776,000 | $ 12,016,000 |  |
Operating Lease, Weighted Average Remaining Lease Term |  |  |  |  |  | 5 years 2 months 12 days | 5 years 2 months 12 days | 5 years 1 month 28 days | 4 years 14 days |  |
Operating Lease, Weighted Average Discount Rate, Percent |  |  |  |  |  | 6.59% | 6.59% | 3.59% | 3.22% |  |
Operating Lease, Payments |  |  |  |  |  | $ 4,222,000 |  | $ 3,954,000 | $ 2,064,000 |  |
Tabasalu, Estonia [Member] |  |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  |  | 49,000 | 49,000 |  |  |  |
Lessee, Operating Lease, Term of Contract |  |  |  |  |  | 10 years | 10 years |  |  |  |
Operating Lease, Monthly Payment | € |  | € 25,000 |  |  | € 20,400 |  |  |  |  |  |
Operating Lease, Payments, Annual Increase, Percentage |  | 5.00% |  |  |  |  |  |  |  |  |
7050 Winnetka Avenue North, Brooklyn Park, Minnesota [Member] |  |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  |  |  |  |  |  |  | 85,000
Lessee, Operating Lease, Term of Contract |  |  |  |  |  |  |  |  |  |  | 10 years
Lessee, Operating Lease, Renewal Term (Year) | 3 years |  |  | 3 years | 3 years |  |  |  |  |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  |  |  | $ 1,337,000 |  |  |  |  |  |  |
Tijuana, Mexico 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  | 318,000 |  |  |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term (Year) |  |  |  |  |  | 5 years | 5 years |  |  |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  |  |  | $ 8,637,000 |  |  |  |  |  |  |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract |  |  | 7 years |  |  |  |  |  |  |  |
Operating Lease, Monthly Payment |  |  | $ 169,000 |  |  |  |  |  |  |  |
Operating Lease, Payments, Annual Increase, Percentage |  |  | 2.00% |  |  |  |  |  |  |  |
Tijuana, Mexico 3 [Member] | Lease Mandatory Contractual Term [Member] |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract |  |  | 5 years |  |  |  |  |  |  |  |
Tijuana, Mexico 3 [Member] | Termination of Lease [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Operating Lease Liability | $ (5,610,000) |  |  |  |  |  |  |  |  |  |
Brooklyn Part, MN [Member] |  |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  |  |  |  |  |  | 105,000 |
Lessee, Operating Lease, Lease Not yet Commenced, Renewal Term (Year) |  |  |  |  |  |  |  |  |  | 5 years |
Oulu, Finland [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Monthly Payment | € |  |  |  |  |  |  | € 40,000 |  |  |  |
Oulu, Finland [Member] | Nestor Cables Lease [Member] |  |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  |  |  | 25,000 | 25,000 |  |  |  |

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