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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2021
Notes Tables |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2021 |  |  | September 30, 2020 |
Less than one year |  | $ | 10,373,831 |  |  | $ | 10,582,527 |
1-5 years |  |  | 36,912,777 |  |  |  | 25,143,000 |
Total |  | $ | 47,286,608 |  |  | $ | 35,725,527 |
Financing 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, 2021 |  | $ | 289,085 |  |  | $ | (209,612 | ) |  | $ | - |  |  | $ | 79,473 |
September 30, 2020 |  | $ | 289,085 |  |  | $ | - |  |  | $ | - |  |  | $ | 289,085 |
Schedule of Inventory, Current [Table Text Block] |
|  | September 30, 2021 |  |  | September 30, 2020 |
Raw materials |  | $ | 23,071,833 |  |  | $ | 12,287,134 |
Work-in-process |  |  | 2,481,890 |  |  |  | 1,033,021 |
Finished goods |  |  | 3,361,576 |  |  |  | 2,048,514 |
Inventories, gross |  |  | 28,915,299 |  |  |  | 15,368,669 |
Inventory reserve |  |  | (1,390,988 | ) |  |  | (960,131 | )
Inventories, net |  | $ | 27,524,311 |  |  | $ | 14,408,538 |
Property, Plant and Equipment [Table Text Block] |
|  | September 30, 2021 |  |  | September 30, 2020 |
Manufacturing equipment |  | $ | 9,178,935 |  |  | $ | 8,171,497 |
Office equipment |  |  | 2,901,385 |  |  |  | 2,478,056 |
Leasehold improvements |  |  | 2,589,777 |  |  |  | 2,576,861 |
Vehicles |  |  | 245,903 |  |  |  | 245,903 |
Construction in progress |  |  | 150,343 |  |  |  | 19,143 |
Property, plant and equipment, gross |  |  | 15,066,343 |  |  |  | 13,491,460 |
Less accumulated depreciation |  |  | 10,068,685 |  |  |  | 8,538,641 |
Property, plant and equipment, net |  | $ | 4,997,658 |  |  | $ | 4,952,819 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | September 30, 2021 |
|  | Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value Amount |
Customer relationships |  |  | 15 |  |  | $ | 3,742,000 |  |  | $ | 904,317 |  |  | $ | 2,837,683 |
Certifications |  |  | 8 |  |  |  | 1,068,000 |  |  |  | 483,937 |  |  |  | 584,063 |
Trademarks |  |  | 8 |  |  |  | 563,000 |  |  |  | 255,109 |  |  |  | 307,891 |
Patents |  |  | 20 |  |  |  | 790,384 |  |  |  | 84,660 |  |  |  | 705,724 |
Other |  |  | 5 |  |  |  | 31,091 |  |  |  | 24,873 |  |  |  | 6,218 |
Software |  |  | 1 | - | 3 |  |  |  | 1,959,670 |  |  |  | 1,705,098 |  |  |  | 254,572 |
Totals |  |  |  |  |  | $ | 8,154,145 |  |  | $ | 3,457,994 |  |  | $ | 4,696,151 |
|  | September 30, 2020 |
|  | Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value Amount |
Customer relationships |  |  | 15 |  |  | $ | 3,742,000 |  |  | $ | 654,850 |  |  | $ | 3,087,150 |
Certifications |  |  | 8 |  |  |  | 1,068,000 |  |  |  | 350,437 |  |  |  | 717,563 |
Trademarks |  |  | 8 |  |  |  | 563,000 |  |  |  | 184,734 |  |  |  | 378,266 |
Patents |  |  | 20 |  |  |  | 689,889 |  |  |  | 56,257 |  |  |  | 633,632 |
Other |  |  | 5 |  |  |  | 31,091 |  |  |  | 18,655 |  |  |  | 12,436 |
Software |  |  | 1 | - | 3 |  |  |  | 1,695,559 |  |  |  | 1,538,390 |  |  |  | 157,169 |
Totals |  |  |  |  |  | $ | 7,789,539 |  |  | $ | 2,803,323 |  |  | $ | 4,986,216 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | Estimated amortization expense |
FY 2022 |  | $ | 592,192 |
FY 2023 |  |  | 531,237 |
FY 2024 |  |  | 497,387 |
FY 2025 |  |  | 453,342 |
FY 2026 |  |  | 325,920 |
Total |  | $ | 2,400,078 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Year ended September 30, |  | 2021 |  |  | 2020 |
Net income |  | $ | 20,327,380 |  |  | $ | 7,293,066 |
Weighted average common shares |  |  | 13,720,699 |  |  |  | 13,643,355 |
Dilutive potential common shares |  |  | 63,594 |  |  |  | - |
Weighted average dilutive common shares outstanding |  |  | 13,784,293 |  |  |  | 13,643,355 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 1.48 |  |  | $ | 0.53 |
Diluted |  | $ | 1.47 |  |  | $ | 0.53 |
Useful Lives [Member] |
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
| Years
Equipment | 3 – 7
Leasehold improvements | 7-10 or life of lease
Vehicles | 3

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