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Note A - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2019
Notes Tables |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2019 |  | September 30, 2018
Less than one year |  | $ | 13,524,270 |  |  | $ | 8,930,225 |
1-5 years |  |  | 23,902,000 |  |  |  | 17,974,000 |
Total |  | $ | 37,426,270 |  |  | $ | 26,904,225 |
Financing Receivable, Allowance for Credit Loss [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, 2019 |  | $ | 79,085 |  |  | $ | 210,000 |  |  | $ | - |  |  | $ | 289,085 |
September 30, 2018 |  |  | 79,085 |  |  |  | - |  |  |  | - |  |  |  | 79,085 |
September 30, 2017 |  |  | 93,473 |  |  |  | - |  |  |  | (14,338 | ) |  |  | 79,085 |
Schedule of Inventory, Current [Table Text Block] |
|  | September 30, 2019 |  | September 30, 2018
Raw materials |  | $ | 7,115,298 |  |  | $ | 6,013,166 |
Work-in-process |  |  | 540,962 |  |  |  | 560,988 |
Finished goods |  |  | 1,356,720 |  |  |  | 3,475,981 |
Inventories, net |  | $ | 9,012,980 |  |  | $ | 10,050,135 |
Property, Plant and Equipment [Table Text Block] |
|  | September 30, 2019 |  | September 30, 2018
Manufacturing equipment |  | $ | 7,106,041 |  |  | $ | 5,202,532 |
Office equipment |  |  | 3,996,251 |  |  |  | 3,809,614 |
Leasehold improvements |  |  | 2,436,346 |  |  |  | 2,417,786 |
Vehicles |  |  | 245,903 |  |  |  | 226,221 |
Construction in progress |  |  | 8,921 |  |  |  | - |
Property, plant and equipment, gross |  |  | 13,793,462 |  |  |  | 11,656,153 |
Less accumulated depreciation |  |  | 8,380,221 |  |  |  | 6,911,569 |
Property, plant and equipment, net |  | $ | 5,413,241 |  |  | $ | 4,744,584 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | September 30, 2019
|  | Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value Amount
Customer relationships |  |  | 15 |  |  | $ | 3,742,000 |  |  | $ | 405,384 |  |  | $ | 3,336,616 |
Certifications |  |  | 8 |  |  |  | 1,068,000 |  |  |  | 216,937 |  |  |  | 851,063 |
Trademarks |  |  | 8 |  |  |  | 563,000 |  |  |  | 114,359 |  |  |  | 448,641 |
Patents |  |  | 20 |  |  |  | 530,409 |  |  |  | 38,247 |  |  |  | 492,162 |
Other |  |  | 5 |  |  |  | 31,091 |  |  |  | 12,438 |  |  |  | 18,653 |
Totals |  |  |  |  |  | $ | 5,934,500 |  |  | $ | 787,365 |  |  | $ | 5,147,135 |
|  | 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 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Year ended September 30, |  | 2019 |  | 2018 |  | 2017
Net income |  | $ | 4,566,156 |  |  | $ | 4,274,547 |  |  | $ | 3,847,839 |
Weighted average common shares |  |  | 13,442,871 |  |  |  | 13,429,232 |  |  |  | 13,532,375 |
Dilutive potential common shares |  |  | 8,343 |  |  |  | 23,628 |  |  |  | 128,431 |
Weighted average dilutive common shares outstanding |  |  | 13,451,214 |  |  |  | 13,452,860 |  |  |  | 13,660,806 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.34 |  |  | $ | 0.32 |  |  | $ | 0.28 |
Diluted |  | $ | 0.34 |  |  | $ | 0.32 |  |  | $ | 0.28 |
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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