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Note D - Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | September 30, |  | September 30, |  | September 30,
|  | 2019 |  | 2018 |  | 2017
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 1,260,552 |  |  | $ | 1,472,512 |  |  | $ | 1,627,125 |
State |  |  | 103,130 |  |  |  | 120,034 |  |  |  | 78,552 |
Current income tax expense |  |  | 1,363,682 |  |  |  | 1,592,546 |  |  |  | 1,705,677 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (38,534 | ) |  |  | (463,798 | ) |  |  | 8,680 |
State |  |  | 35,289 |  |  |  | 124,657 |  |  |  | 23,617 |
Deferred income tax expense |  |  | (3,245 | ) |  |  | (339,141 | ) |  |  | 32,297 |
Income tax expense |  | $ | 1,360,437 |  |  | $ | 1,253,405 |  |  | $ | 1,737,974 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | September 30, |  | September 30, |  | September 30,
|  | 2019 |  | 2018 |  | 2017
Federal statutory rate |  |  | 21 | % |  |  | 24 | % |  |  | 34 | %
Federal rate change |  |  | - |  |  |  | (5 | %) |  |  | - |
State income taxes |  |  | 2 | % |  |  | 2 | % |  |  | 1 | %
Permanent differences |  |  | - |  |  |  | - |  |  |  | (1 | %)
Change in valuation allowance |  |  | (1 | %) |  |  | (3 | %) |  |  | (4 | %)
Expiration and utilization of state NOL’s |  |  | 2 | % |  |  | 4 | % |  |  | 3 | %
Research and development credits |  |  | (2 | %) |  |  | (1 | %) |  |  | (1 | %)
Excess tax expense (benefits) from stock-based compensation |  |  | 1 | % |  |  | 2 | % |  |  | (1 | %)
Tax rate |  |  | 23 | % |  |  | 23 | % |  |  | 31 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | September 30, |  | September 30,
|  | 2019 |  | 2018
Deferred income tax assets (liabilities): |  |  |  |  |  |  |  |
Intangibles |  | $ | (75,190 | ) |  | $ | (70,467 | )
Property and equipment depreciation |  |  | (521,586 | ) |  |  | (552,119 | )
Net operating loss carry forwards and credits |  |  | 377,505 |  |  |  | 464,274 |
Stock-based compensation |  |  | 114,118 |  |  |  | 151,558 |
Inventories |  |  | 350,197 |  |  |  | 400,111 |
Prepaid expenses |  |  | (63,252 | ) |  |  | (60,806 | )
Accrued expenses and reserves |  |  | 371,414 |  |  |  | 250,787 |
Goodwill |  |  | (607,882 | ) |  |  | (583,415 | )
Gross deferred tax liability |  |  | (54,676 | ) |  |  | (77 | )
Valuation allowance |  |  | (47,014 | ) |  |  | (104,858 | )
Net deferred tax liability |  | $ | (101,690 | ) |  | $ | (104,935 | )
Summary of Valuation Allowance [Table Text Block] |
Year Ended |  | Balance at Beginning of Year |  | Income Tax Expense (Benefit) |  | Reversal for State NOL Expiration and Utilization |  | Balance at End of Year
September 30, 2019 |  | $ | 104,858 |  |  | $ | 10,448 |  |  | $ | (68,292 | ) |  | $ | 47,014 |
September 30, 2018 |  |  | 159,154 |  |  |  | 79,377 |  |  |  | (133,673 | ) |  |  | 104,858 |
September 30, 2017 |  |  | 322,404 |  |  |  | (32,154 | ) |  |  | (131,096 | ) |  |  | 159,154 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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