Annual report pursuant to Section 13 and 15(d)

Note D - Income Taxes (Details Textual)

v3.8.0.1
Note D - Income Taxes (Details Textual)
 3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Effective Income Tax Rate Reconciliation, Percent     31.00% 26.00% 35.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (163,000)        
Income Taxes Receivable, Current 409,000 $ 643,000 $ 409,000 $ 643,000  
Unrecognized Tax Benefits 0 0 0 0 $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense     0 0 $ 0
State and Local Jurisdiction [Member]          
Operating Loss Carryforwards, Valuation Allowance 159,000 322,000 159,000 322,000  
Operating Loss Carryforwards 6,437,000   6,437,000    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]          
Tax Credit Carryforward, Amount 159,000   159,000    
State and Local Jurisdiction [Member] | Alternative Minimum Tax [Member]          
Tax Credit Carryforward, Amount 46,000   $ 46,000    
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards, Expired and Utilized [Member]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (131,000)        
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards, Higher Expected NOL Utilization [Member]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (32,000)        
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   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   (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   (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   (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       $ 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