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Note 13 - Subsequent Events (Details Textual) - USD ($) |  |  | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2017 | May 15, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 27, 2021 | Jan. 27, 2019 | Jan. 27, 2018 | Jul. 26, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 223,200 | [1] | 268,000 | [1] |  |  |  |  | 247,200 | 218,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  | $ 3.79 |  | $ 3.79 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 6,000 |  | 50,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | [1] |  |  | 180,534 |  | 181,533 |  |  |  |  |  |  |
Consultant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly Consulting Fees |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Ferguson Stock Option [Member] | Scenario, Forecast [Member] | Vesting for Treatment and Disposal of Three Gallons of Waste by January 27, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  |  |  |  |  |  |  | 10,000 |  |  |
The 2017 Stock Option Plan [Member] | Ferguson Stock Option [Member] | Scenario, Forecast [Member] | Vesting for Treatment and Disposal of 2,000 Gallons of Waste by January 27, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  |  |  |  |  |  | 30,000 |  |  |  |
The 2017 Stock Option Plan [Member] | Ferguson Stock Option [Member] | Scenario, Forecast [Member] | Vesting for Treatment and Disposal of 50,000 Gallons of Waste by January 27, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  |  |  |  |  | 60,000 |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 540,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Rollover Options |  | 140,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 3.65 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 6 years |  |  |  |  |  |  |  |  |  |  |
Percentage of Fair Market Value of Common Stock to Determine Number of Shares to Directors |  | 110.00% |  |  |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member] | The 10 percent of Stockholder [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 5 years |  |  |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Incentive Stock Options [Member] | Executive Vice President/Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Employee Stock Option [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Ferguson Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 7 years |  |  |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan [Member] | Subsequent Event [Member] | Ferguson Stock Option [Member] | Consultant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 3.65 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
The 2010 Stock Option Plan [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 3.97 |  |  |  |  |  |  |  |  |  |
The 2010 Stock Option Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 60,000 |  |  |  |  |  |  |  |  |  |  |
The 2003 Outside Directors Stock Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  | 99,900 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
[1] | The risk-free interest rate is based on the U.S. Treasury yield in effect at the grant date over the expected term of the option.

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