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Note 8 - Common Stock (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Oct. 31, 2014 | Mar. 31, 2017 | Mar. 31, 2016 | Nov. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 14, 2016 | Jun. 13, 2016
Common Stock, Shares Authorized | 300,000,000 |  | 300,000,000 |  |  | 300,000,000 | 150,000,000 |  | 300,000,000 | 150,000,000
Stock Issued During Period, Shares, Warrants Exercised | 983,334 |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ 49,167 |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 92,895,777 |  | 92,895,777 |  |  | 95,106,312 |  |  |  |
2006 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 14,580 | $ 13,686 |  | $ 54,805 | $ 67,905 | $ 101,191 |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  | 1,705,500 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  | 10 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 3 years |  |  |  |
2006 Equity Incentive Plan [Member] | Incentive Stock Options (ISO's) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  |  |  |  | 110.00% |  |  |  |
Equity Incentive Plan 2016 [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  | 3,000,000 |  |  |  |
Expense Associated with Warrant Modifications [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised |  | 3,176,000 |  |  |  | 21,884,420 |  |  |  |
Proceeds from Warrant Exercises |  | $ 873,400 |  |  |  | $ 1,339,801 |  |  |  |
Third Party Consulting Services [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  | 378,205 |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 100,000 |  |  |  |  |

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