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Note 5 - Stockholders' Equity (Details Textual) - USD ($)							3 Months Ended	9 Months Ended		12 Months Ended
	Jun. 20, 2016	Mar. 21, 2016	Aug. 04, 2015	Jun. 24, 2015	Apr. 20, 2015	Aug. 07, 2007	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
The 2015 Unit A Offering to Common Stock [Member]
Stock Issued During Period, Shares, Conversion of Convertible Securities							1,341,301		0
Stock Issued During Period, Value, Conversion of Convertible Securities							$ 352,566
The 2007 Equity Incentive Plan [Member] \| Chief Technical Officer [Member] \| Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense				$ 68,000
The 2007 Equity Incentive Plan [Member] \| Chief Technical Officer [Member]
Sharebased Compensation Arrangement By Sharebased Payment Award Options Expiration Period Extension				0 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				200,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 0.575
The 2007 Equity Incentive Plan [Member] \| Non-employee Members of the Board of Directors [Member] \| Selling, General and Administrative Expenses [Member]
Sharebased Compensation Arrangement by Sharebased Payment Award Options Granted in Period Fair Value	$ 18,000			$ 15,200
The 2007 Equity Incentive Plan [Member] \| Non-employee Members of the Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	40,000			40,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0.45			$ 0.38
The 2007 Equity Incentive Plan [Member] \| Board of Directors and Vendors [Member]
Sharebased Compensation Arrangement By Sharebased Payment Award Options Expiration Period Extension		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		307,777
The 2007 Equity Incentive Plan [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number									15,000
The 2007 Equity Incentive Plan [Member] \| Consultants, Vendors, and Employees [Member]
Sharebased Compensation Arrangement By Sharebased Payment Award Options Expiration Period Extension			5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			1,772,581
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 0.30
The 2007 Equity Incentive Plan [Member] \| A Consultant [Member]
Sharebased Compensation Arrangement By Sharebased Payment Award Options Expiration Period Extension					10 years
Allocated Share-based Compensation Expense								$ 79,280	$ 49,550
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					700,000
Sharebased Compensation Arrangement by Sharebased Payment Award Options Granted in Period Fair Value					$ 238,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price					$ 0.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 0.34
The 2007 Equity Incentive Plan [Member] \| Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense		$ 119,971	$ 620,403
The 2007 Equity Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period						10 years
The 2007 Equity Incentive Plan [Member]
Allocated Share-based Compensation Expense								$ 76,950	$ 68,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross									300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number									120,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period								262,500
Part of 2007 Equity Incentive Plan and Options Issued Outside of 2007 Equity Incentive Plan [Member] \| Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense								$ 645,808	$ 1,638,706
Outside of the 2007 Plan [Member] \| Selling, General and Administrative Expenses [Member] \| Board of Directors and Vendors [Member]
Stock Granted, Value, Share-based Compensation, Gross								$ 329,607	$ 808,615
Outside of the 2007 Plan [Member] \| Maximum [Member] \| Board of Directors and Vendors [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price								$ 0.76	$ 0.36
Outside of the 2007 Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price									0.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price											$ 1
Outside of the 2007 Plan [Member] \| Minimum [Member] \| Board of Directors and Vendors [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price								$ 0.33	$ 0.33
Outside of the 2007 Plan [Member] \| Board of Directors and Vendors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross								906,973	1,893,434
Other Liabilities, Current							$ 266,504	$ 266,504
Outside of the 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross								906,973	1,893,434
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price								$ 0.48	$ 0.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price							$ 0.41	$ 0.41	$ 0.44	$ 0.40	$ 0.40
Other Liabilities, Current									$ 398,150
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value								$ 39,100	$ 77,028
Officers and Consultants [Member] \| Selling, General and Administrative Expenses [Member] \| Accrued and Unpaid Salary and Unreimbursed Expenses [Member]
Common Stock, Shares, Issued							1,776,664	1,776,664	1,252,339
Stock Issued During Period, Value, Issued for Services								$ 702,743	$ 530,737
Employee Stock Option [Member]
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate								0.00%
Preferred Stock, Shares Outstanding							0	0		0
Stock Issued During Period, Shares, Exercise of Warrants							1,150,000			0
Common Stock, Shares, Issued							89,915,980	89,915,980		85,648,015
Stock Issued During Period, Value, Conversion of Convertible Securities								$ 352,566
Stock Issued During Period, Value, Exercise of Warrants							$ 355,000	$ 355,000