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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
(In thousands) |  | September 30, 2023 |  |  | September 30, 2022 |
Cash and cash equivalents: |  |  |  |  |  |  |  |
Cash including money market accounts |  | $ | 11,360 |  |  | $ | 16,635 |
Money market funds |  |  | 26,467 |  |  |  | 15 |
Total cash and cash equivalents |  | $ | 37,827 |  |  | $ | 16,650 |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
Year Ended |  | Balance at Beginning of Year |  |  | Additions (Recoveries) Charged to Costs and Expenses |  |  | Less Write-offs |  |  | Balance at End of Year |
September 30, 2023 |  | $ | 79,000 |  |  | $ | - |  |  | $ | - |  |  | $ | 79,000 |
September 30, 2022 |  | $ | 79,000 |  |  |  |  |  |  | $ | - |  |  | $ | 79,000 |
Schedule of Inventory, Current [Table Text Block] |
|  | September 30, 2023 |  |  | September 30, 2022 |
(In thousands) |  |  |  |  |  |  |  |
Raw materials |  | $ | 73,657 |  |  | $ | 69,142 |
Work-in-process |  |  | 1,462 |  |  |  | 4,592 |
Finished goods |  |  | 29,696 |  |  |  | 10,803 |
Inventories, gross |  |  | 104,815 |  |  |  | 84,537 |
Inventory reserve |  |  | (6,760 | ) |  |  | (2,329 | )
Inventories, net |  | $ | 98,055 |  |  | $ | 82,208 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | September 30, 2023 |
(In thousands) |  | Useful Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value Amount |
Customer relationships |  |  | 15 |  |  | $ | 4,894 |  |  | $ | 1,582 |  |  | $ | 3,312 |
Certifications |  |  | 8 |  |  |  | 584 |  |  |  | 267 |  |  |  | 317 |
Trademarks |  |  | 8-10 |  |  |  | 1,333 |  |  |  | 700 |  |  |  | 633 |
Patents |  |  | 20 |  |  |  | 1,119 |  |  |  | 165 |  |  |  | 954 |
Developed Technology |  |  | 10 |  |  |  | 311 |  |  |  | 22 |  |  |  | 289 |
Other |  |  | 5 |  |  |  | 6 |  |  |  | 6 |  |  |  | - |
Software |  |  | 1-3 |  |  |  | 2,613 |  |  |  | 2,026 |  |  |  | 587 |
Totals |  |  |  |  |  | $ | 10,860 |  |  | $ | 4,768 |  |  | $ | 6,092 |
|  | September 30, 2022 |
(In thousands) |  | Useful Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value Amount |
Customer relationships |  |  | 15 |  |  | $ | 4,833 |  |  | $ | 1,273 |  |  | $ | 3,559 |
Certifications |  |  | 8 |  |  |  | 584 |  |  |  | 133 |  |  |  | 451 |
Trademarks |  |  | 8-10 |  |  |  | 1,306 |  |  |  | 586 |  |  |  | 720 |
Patents |  |  | 20 |  |  |  | 931 |  |  |  | 118 |  |  |  | 813 |
Developed Technology |  |  | 10 |  |  |  | 295 |  |  |  | 5 |  |  |  | 290 |
Other |  |  | 5 |  |  |  | 6 |  |  |  | 6 |  |  |  | - |
Software |  |  | 1-3 |  |  |  | 2,452 |  |  |  | 1,909 |  |  |  | 543 |
Totals |  |  |  |  |  | $ | 10,407 |  |  | $ | 4,030 |  |  | $ | 6,376 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
(In thousands) |  | Estimated amortization expense |
FY 2024 |  | $ | 1,148 |
FY 2025 |  |  | 698 |
FY 2026 |  |  | 563 |
FY 2027 |  |  | 469 |
FY 2028 |  |  | 460 |
Thereafter |  |  | 2,754 |
Total |  | $ | 6,092 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Year ended September 30, (In thousands except share data) |  | 2023 |  |  | 2022 |  |  | 2021 |
Net income |  | $ | 32,533 |  |  | $ | 49,362 |  |  | $ | 20,327 |
Weighted average common shares |  |  | 14,975,972 |  |  |  | 13,771,665 |  |  |  | 13,720,699 |
Dilutive potential common shares |  |  | 36,555 |  |  |  | 134,319 |  |  |  | 63,593 |
Weighted average dilutive common shares outstanding |  |  | 15,012,527 |  |  |  | 13,905,984 |  |  |  | 13,784,294 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.17 |  |  | $ | 3.58 |  |  | $ | 1.48 |
Diluted |  | $ | 2.17 |  |  | $ | 3.55 |  |  | $ | 1.47 |
Useful Lives [Member] |
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | Years |
Equipment |  |  | 3 – 15 |
Leasehold improvements |  |  | 7-10 or life of lease |
Vehicles |  |  | 3 |
(In thousands) |  | September 30, 2023 |  |  | September 30, 2022 |
Manufacturing equipment |  | $ | 23,580 |  |  | $ | 18,418 |
Office equipment |  |  | 4,560 |  |  |  | 4,174 |
Leasehold improvements |  |  | 6,107 |  |  |  | 5,000 |
Vehicles |  |  | 446 |  |  |  | 340 |
Construction in progress |  |  | 2,447 |  |  |  | 1,715 |
Property, plant and equipment, gross |  |  | 37,140 |  |  |  | 29,647 |
Less accumulated depreciation |  |  | 15,613 |  |  |  | 11,418 |
Property, plant and equipment, net |  | $ | 21,527 |  |  | $ | 18,229 |

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