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Note A - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2018
Notes Tables |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2018 |  | September 30, 2017
Less than one year |  | $ | 8,930,225 |  |  | $ | 5,937,150 |
1-5 years |  |  | 17,974,000 |  |  |  | 19,816,000 |
Total |  | $ | 26,904,225 |  |  | $ | 25,753,150 |
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
Year Ended |  |  | Balance at Beginning of Year |  |  |  | Additions Charged to Costs and Expenses |  |  |  | Less Write-offs |  |  |  | Balance at End of Year |
September 30, 2018 |  | $ | 79,085 |  |  | $ | - |  |  | $ | - |  |  | $ | 79,085 |
September 30, 2017 |  |  | 93,473 |  |  |  | - |  |  |  | (14,388 | ) |  |  | 79,085 |
September 30, 2016 |  |  | 79,473 |  |  |  | 25,000 |  |  |  | (11,000 | ) |  |  | 93,473 |
Schedule of Inventory, Current [Table Text Block] |
|  |  | September 30, 2018 |  |  |  | September 30, 2017 |
Raw materials |  | $ | 6,013,166 |  |  | $ | 5,991,863 |
Work-in-process |  |  | 560,988 |  |  |  | 724,248 |
Finished goods |  |  | 3,475,981 |  |  |  | 1,737,456 |
Inventories, net |  | $ | 10,050,135 |  |  | $ | 8,453,567 |
Property, Plant and Equipment [Table Text Block] |
|  |  | September 30, 2018 |  |  |  | September 30, 2017 |
Manufacturing equipment |  | $ | 5,202,532 |  |  | $ | 5,370,962 |
Office equipment |  |  | 3,809,614 |  |  |  | 3,600,006 |
Leasehold improvements |  |  | 2,417,786 |  |  |  | 2,404,331 |
Vehicles |  |  | 226,221 |  |  |  | 193,702 |
Property, plant and equipment, gross |  |  | 11,656,153 |  |  |  | 11,569,001 |
Less accumulated depreciation |  |  | 6,911,569 |  |  |  | 6,134,829 |
Property, plant and equipment, net |  | $ | 4,744,584 |  |  | $ | 5,434,172 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | September 30, 2018
|  |  | Years |  |  |  | Gross Carrying Amount |  |  |  | Accumulated Amortization |  |  |  | Net Book Value Amount |
Customer relationships |  |  | 15 |  |  | $ | 3,742,000 |  |  | $ | 155,917 |  |  | $ | 3,586,083 |
Certifications |  |  | 8 |  |  |  | 1,068,000 |  |  |  | 83,437 |  |  |  | 984,563 |
Trademarks |  |  | 8 |  |  |  | 563,000 |  |  |  | 43,984 |  |  |  | 519,016 |
Patents |  |  | 20 |  |  |  | 393,002 |  |  |  | 24,981 |  |  |  | 368,021 |
Other |  |  | 5 |  |  |  | 31,091 |  |  |  | 6,219 |  |  |  | 24,872 |
Totals |  |  |  |  |  | $ | 5,797,093 |  |  | $ | 314,538 |  |  | $ | 5,482,555 |
|  | September 30, 2017
|  |  | Years |  |  |  | Gross Carrying Amount |  |  |  | Accumulated Amortization |  |  |  | Net Book Value Amount |
Patents |  |  | 20 |  |  | $ | 269,433 |  |  | $ | 15,737 |  |  | $ | 253,696 |
Other |  |  | 5 |  |  |  | 31,091 |  |  |  | - |  |  |  | 31,091 |
Totals |  |  |  |  |  | $ | 300,524 |  |  | $ | 15,737 |  |  | $ | 284,787 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
| Year ending September 30 |  |  |  | Amount |
| 2019 |  |  | $ | 471,215 |
| 2020 |  |  |  | 471,215 |
| 2021 |  |  |  | 471,215 |
| 2022 |  |  |  | 471,215 |
| 2023 |  |  |  | 464,997 |
| Thereafter |  |  |  | 3,132,698 |
| Total future amortization expense |  |  | $ | 5,482,555 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Year ended September 30, |  | 2018 |  | 2017 |  | 2016
Net income |  | $ | 4,274,547 |  |  | $ | 3,847,839 |  |  | $ | 8,013,062 |
Weighted average common shares |  |  | 13,429,232 |  |  |  | 13,532,375 |  |  |  | 13,372,579 |
Dilutive potential common shares |  |  | 23,628 |  |  |  | 128,431 |  |  |  | 290,770 |
Weighted average dilutive common shares outstanding |  |  | 13,452,860 |  |  |  | 13,660,806 |  |  |  | 13,663,349 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.32 |  |  | $ | 0.28 |  |  | $ | 0.60 |
Diluted |  | $ | 0.32 |  |  | $ | 0.28 |  |  | $ | 0.59 |
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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