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Note C - Shareholders' Equity (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Common Stock, Shares Authorized |  |  |  |  | 50,000,000 | 50,000,000 |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |
Preferred Stock, Shares Authorized |  |  |  |  | 500,000 | 500,000 |
Preferred Stock, Shares Issued, Total |  |  |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  | 1,003,644 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total |  |  |  |  | $ 3,522,909 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 6 years 36 days |  |
Allocated Share-based Compensation Expense, Total |  |  |  |  | $ 2,003,207 | $ 2,319,975 | $ 1,404,899
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 108,000 | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Remaining Contractual Term |  |  |  |  | 4 years 255 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 3 years |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  | $ 13.37 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  | $ 4.78 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  | 1 year 324 days | 2 years 266 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  |  |  |  |  | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  | 8,450 | 15,850 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  | $ 75,767 | $ 237,172 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  | $ 331,535 |  |
Stock Repurchased During Period, Shares |  |  |  |  | 41,989 | 75,445 |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  | $ 11.66 | $ 12.63 |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  | $ 489,428 | $ 952,832 | $ 437,537
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  | 0 | 0 |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 87,081 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Market Price Percentage, Offering Date |  |  |  |  | 85.00% |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 15,932 | 14,242 | 14,723 | 11,144 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price | $ 9.39 | $ 10.41 | $ 11.22 | $ 15.21 |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  | $ 70,905 |  |
Director [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  | 6 years |  |
Employee Stock Option [Member] | Director [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 1 year |  |
Employee Stock Option [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 3 years |  |
Employee Stock Option [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 5 years |  |
Cashless Method Stock Option Exercised [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  | 2,250 | 10,500 |
Restricted Stock [Member] | Minimum [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 1 year |  |
Restricted Stock [Member] | Maximum [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 10 years |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total |  |  |  |  | $ 1,835,086 | $ 2,103,621 | 1,272,656
Cost of Sales [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total |  |  |  |  | $ 168,121 | $ 216,354 | $ 132,243
Undesignated Shares [Member] |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 5,000,000 |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 500,000 |  |
Preferred Stock, Shares Issued, Total |  |  |  |  | 0 |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  | 0 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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