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Note 11 - Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 07, 2016 | Sep. 18, 2015 | Aug. 31, 2015 | Jun. 06, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 155,606 |  | $ 2,953 |  |  |  |
Proceeds from Stock Options Exercised | $ 223,404 | $ 0 | 9,920 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 180 days |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 0 | $ 0 | 0 |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.0024 | $ 0.0024 |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 1,150,793 |  |  | 2,200,000 | 2,200,000 | 1,200,000 |
Treasury Stock, Shares, Acquired | 0 |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 300,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 174,314 |  |  |  |  |  |
Restricted Stock [Member] | Operating Expense [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 239,599 | $ 199,870 | $ 145,321 |  |  |  |
2007 Director Non-Qualified Stock Option Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |  |  |  |
Restricted Stock Plan [Member] | Restricted Stock [Member] | Executive Officers, Non-employee Directors and Other Key Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 300,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 188,225 |  |  |  |  |  |
Stockholder Rights Plan [Member] |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  | $ 0.0024
Stockholder Rights Plan [Member] | Preferred Share Purchase Right [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  | $ 30
Class Of Warrant Or Right Exercisable, Condition Common Stock Ownership, Percentage |  |  |  |  |  |  | 20.00%

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