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Note D - Income Taxes (Details Textual) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2015 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  |  | 23.00% | 31.00% | 26.00% |
Accrued Income Taxes, Current |  | $ 464,000 |  |  | $ 464,000 |  |  |
Income Taxes Receivable, Current |  |  |  |  |  | $ 409,000 |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 104,858 |  | $ 322,404 | 104,858 | 159,154 | $ 322,404 | $ 658,808
Unrecognized Tax Benefits, Ending Balance |  | 0 |  | 0 | 0 |  | 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total |  |  |  |  | 0 | 0 | 0 |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Valuation Allowance, Total |  | 105,000 |  |  | 105,000 | $ 159,000 |  |
Operating Loss Carryforwards, Total |  | 3,468,000 |  |  | 3,468,000 |  |  |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |
Tax Credit Carryforward, Amount |  | 198,000 |  |  | 198,000 |  |  |
State and Local Jurisdiction [Member] | Alternative Minimum Tax [Member] |  |  |  |  |  |  |  |
Tax Credit Carryforward, Amount |  | 50,000 |  |  | 50,000 |  |  |
State and Local Jurisdiction [Member] | Research and Development and Alternative Minimum Tax Credit Carryforwards [Member] |  |  |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 0 |  |  | 0 |  |  |
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to Operating Loss Carryforwards [Member] |  |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ (86,000) | $ 32,000 |  |  |  |  |
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards, Expired and Utilized [Member] |  |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  | 133,000 |  |  |
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards, Higher Expected NOL Utilization [Member] |  |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  | $ 47,000 |  |  |
Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  | $ 437,096 |  |  | $ 675,183 |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | 16.30% |  |  | 26.40% |
Increase (Decrease) in Earnings Per Share, Basic and Diluted |  |  |  |  |  |  | 0.05 |
Increase (Decrease) in Effective Income Tax Rate Reconciliation, Percent |  |  |  | 13.70% |  |  | 6.20% |
Increase (Decrease) in Earnings Per Share, Basic |  |  |  | 0.03 |  |  |  |
Increase (Decrease) in Earnings Per Share, Diluted |  |  |  | 0.04 |  |  |  |
Adjustments for New Accounting Principle, Early Adoption [Member] | December 31, 2015 [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  | $ 104,134 |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | (5.20%) |  |  |  |
Increase (Decrease) in Earnings Per Share, Basic and Diluted |  |  |  | 0.01 |  |  |  |
Adjustments for New Accounting Principle, Early Adoption [Member] | March 31, 2016 [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  | $ 54,313 |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | (2.50%) |  |  |  |
Increase (Decrease) in Earnings Per Share, Basic and Diluted |  |  |  | 0 |  |  |  |
Adjustments for New Accounting Principle, Early Adoption [Member] | June 30, 2016 [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  | $ 79,640 |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | (2.30%) |  |  |  |
Increase (Decrease) in Earnings Per Share, Basic and Diluted |  |  |  | 0.01 |  |  |  |
Reclassification of Excess Tax Benefits Related to Stock-based Employee Awards from Financing Activities to Operating Activities [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax, Total | $ 1,864,980 |  |  |  |  |  |  |
Reclassification of Excess Tax Benefits Related to Stock-based Employee Awards from Financing Activities to Operating Activities [Member] | Three Months Ended December 31, 2015 [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  | $ 348,000 |  |  |  |
Reclassification of Excess Tax Benefits Related to Stock-based Employee Awards from Financing Activities to Operating Activities [Member] | Six Months Ended March 31, 2016 [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  | 741,000 |  |  |  |
Reclassification of Excess Tax Benefits Related to Stock-based Employee Awards from Financing Activities to Operating Activities [Member] | Nine Months Ended June 30, 2016 [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  | $ 1,786,000 |  |  |  |

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