Note 3 - Basis of Reporting and Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

	Fair value measurement						Carrying amount
	Level 1		Level 2		Level 3		June 30, 2017		December 31, 2016
Financial instruments:
Series 2023 PIK Note Derivative	$	-0-	$	-0-	$	46,170	$	46,170	$	142,909
Series A PIK Note Derivative	$	-0-	$	-0-	$	518,579	$	518,579	$	2,033,643

Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at December 31, 2016	$	2,176,552
Issuance of additional PIK Notes		25,038
Net unrealized gains included in net (loss)		(1,636,841	)
Balance at June 30, 2017	$	564,749

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

Series 2023 PIK Note derivative liability	Fair Value Measurement
	Inputs
	June 30, 2017			December 31, 2016
Market price and estimated fair value of stock	$	0.04		$	0.12
Exercise price	$	1.28		$	1.28
Term (years)		6.08			6.58
Dividend yield	$	- 0 -		$	- 0 -
Expected volatility		96.5	%		86.2	%
Risk-free interest rate		2.03	%		2.18	%

Series A PIK Note derivative liability	Fair Value Measurement
	Inputs
	June 30, 2017			December 31, 2016
Market price and estimated fair value of stock	$	0.04		$	0.12
Exercise price	$	0.83		$	0.83
Term (years)		6.08			6.58
Dividend yield	$	- 0 -		$	- 0 -
Expected volatility		96.5	%		86.2	%
Risk-free interest rate		2.03	%		2.18	%