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Note 11 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2014 | Jun. 09, 2014 | Mar. 31, 2016 | Feb. 28, 2015 | Feb. 28, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 07, 2016 | Aug. 31, 2015 | Jun. 06, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 180 days |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 0 | $ 9,920 | $ 52,722 |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.25 |  |  |  |  |  |  |  |  |
Payments of Dividends | $ 2,500,000 |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  | $ 0.0024 | $ 0.0024 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  | 2,200,000 | 1,200,000 |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 520,500 | 529,000 | 0 |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  | $ 7.06 | $ 7.01 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | $ 3,675,654 | $ 3,708,862 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 300,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  | 33,685 | 34,484 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  |  |  | $ 374,040 |  |  |  |  |
Restricted Stock [Member] | Operating Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | $ 199,870 | $ 145,321 | $ 67,818 |  |  |
2007 Director Non-Qualified Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 6 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 100,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  | 10 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 21,400 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options |  |  |  |  |  | $ 0 |  |  |  |  |
Restricted Stock Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 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 |  |  |  |  |  | 197,230 |  |  |  |  |
Restricted Stock Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 11,765 | 9,344 | 9,375 |  |  |  |  |  |
Restricted Stock Plan [Member] | Restricted Stock [Member] | Independent Director 1 Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 2,031 | 1,613 | 1,619 |  |  |  |  |  |
Stockholder Rights Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  |  |  | $ 0.0024
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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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