Note 9 - Stock-based Compensation and Other Employee Benefit Plans (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2016

Dec. 31, 2015

Notes Tables

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

									Weighted
Balance, September 30, 2015:						Exercise			Average
	Options		Shares			Price			Price per
	Outstanding		Available			per share			share
Balances as of December 31, 2014		8,601,086		3,398,914		$0.23	–	1.89	$	0.44
Granted		1,040,000		(1,040,000	)	0.30	–	0.58		0.35
Plan classification		600,000		(600,000	)	0.30	–	0.60		0.33
Balance, September 30, 2015		10,241,086		2,158,914		$0.23	–	1.89	$	0.43

										Weighted
							Exercise			Average
Balance, September 30, 2016:	Options			Shares			Price			Price per
	Outstanding			Available			per share			share
Balances as of December 31, 2015		10,241,086			1,758,914		$0.22	–	1.89	$	0.44
Granted		40,000			(40,000	)		0.45			0.45
Cancelled		(262,500	)		262,500			0.40			0.40
Balance, September 30, 2016		10,018,586			1,981,414		$0.22	–	1.89	$	0.46

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

	2015						2016
	Non Plan			2007 Plan			Non Plan			2007 Plan
Risk free interest rate	1.83	–	2.33%	1.60	–	2.38%	1.77	–	2.27%	1.36	–	1.77%
Expected volatility	794	–	821%	322	–	807%	641	–	738%	315	–	641%
Expected dividend yield		–			–			–			–
Forfeiture rate		–			–			–			–
Life in years		7		3	–	7		7			5

	2014						2015
	Non Plan			2007 Plan			Non Plan			2007 Plan
Risk free interest rate	2.25	–	2.76%		2.63	%	1.83	–	2.33%	1.60	–	2.38%
Expected volatility	837	–	935%		927	%	794	–	821%	322	–	807%
Expected dividend yield		—			—			—			—
Forfeiture rate		—			—			—			—
Expected life in years		7			7			7		3	-	7

Outside of 2007 Plan [Member]

Notes Tables

Schedule of Share-based Compensation, Stock Options Plans, Activity [Table Text Block]

Date		Term		Option Shares		Exercise Price		Stock Price on grant date		Fair Value		Expense
December 31, 2015	(1)		10		124,000	$	0.50	$	0.50	$	62,000	$	62,000
December 31, 2015	(2)		10		58,500		0.50		0.50		29,250		29,250
September 22, 2015	(3)		10		103,846		0.65		0.65		67,500		67,500
September 22, 2015	(4)		10		125,770		0.65		0.65		81,750		81,750
September 22, 2015	(5)		10		200,000		0.35		0.65		130,000		110,500
June 29, 2015	(6)		10		218,143		0.35		0.35		76,350		76,350
June 29, 2015	(7)		10		192,857		0.35		0.35		67,500		67,500
April 20, 2015	(8)		10		75,000		0.34		0.34		25,500		25,500
April 19, 2015	(9)		10		200,000		0.37		0.34		74,000		74,000
March 31, 2015	(10)		10		387,676		0.36		0.36		139,563		139,563
March 30, 2015	(11)		10		190,142		0.36		0.36		68,451		68,451
February 5, 2015	(12)		10		200,000		0.33		0.33		66,000		66,000
2014 and prior	(13)				__						__		74,145
Total 2015					2,075,934							$	952,509

Date		Term		Option Shares		Exercise price		Stock price on grant date		Fair Value		Expense
December 26, 2014	(1)		10		192,857	$	0.35	$	0.35	$	67,500	$	67,500
December 26, 2014	(2)		10		250,715		0.35		0.35		87,750		87,750
September 29, 2014	(3)		10		143,617		0.47		0.47		67,500		67,500
September 29, 2014	(4)		10		193,511		0.47		0.47		90,950		90,950
June 24, 2014	(5)		10		103,847		0.65		0.65		67,501		67,501
June 24, 2014	(6)		10		148,848		0.65		0.65		96,750		96,750
March 31, 2014	(7)		10		156,888		0.43		0.43		67,461		67,461
March 31, 2014	(8)		10		78,488		0.43		0.43		33,750		33,750
February 20, 2014	(9)		10		40,000		0.35		0.35		14,000		14,000
2013 and prior	(10)				__						__		40,160
Total													633,332

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Balance, September 30, 2015:							Weighted
	Options			Exercise			Average
	Outstanding			Price per share			Price per  share
Balance, December 31, 2014		17,965,291		$0.18	–	1.00	$	0.40
Granted		1,893,434		0.34	–	0.36		0.35
Expired		(46,250	)		0.30			0.30
Plan classification		(600,000	)	0.30	–	0.63		0.33
Balance, September 30, 2015		19,212,474		$0.18	–	1.00	$	0.44

							Weighted
Balance, September 30, 2016:	Options			Exercise			Average
	Outstanding			Price per share			Price per  share
Balance, December 31, 2015		19,394,975		$0.18	–	1.00	$	0.40
Granted		906,973		0.33	–	0.76	$	0.48
Exercised		(60,000	)		0.25			0.25
Balance, September 30, 2016		20,241,948		$0.18	–	1.00	$	0.41

							Weighted Average
	Options						Price per
	Outstanding			Exercise Price			share
Balances as of December 31, 2013		16,398,395		$0.18	–	$1.00	$	0.39
Granted		1,608,771		$0.25	–	0.30	$	0.50
Exercised		(41,875	)		—			—
Expired		—			—			—
Balances as of December 31, 2014		17,965,294		$0.18	–	$1.00	$	0.40
Granted		2,075,931		$0.25	–	0.65	$	0.40
Exercised		—		0.33	–	0.65		0.40
Reclassification		(600,000	)	0.30	–	0.63		0.33
Expired		(46,250	)		0.30			0.30
Balances as of December 31, 2015		19,394,975		$0.18	–	$1.00	$	0.40

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

				Weighted				Currently Exercisable
				Average		Weighted		Number of
Options				Remaining		Average		Shares at		Weighted
Outstanding at				Contractual		Exercise		December 31,		Average
December 31, 2015	Exercise Price			Life		Price		2015		Exercise Price
7,733,259		$0.18			1	$	0.18		7,733,259	$	0.18
2,400,000		0.99			1		0.99		2,400,000		0.99
691,975		0.55			3		0.55		691,975		0.55
800,000		1.00			6		1.00		483,333		1.00
168,750		0.40			7		0.40		168,750		0.40
1,456,110		0.30			7		0.30		1,456,110		0.30
3,288,246	0.25	–	0.65		8		0.28		3,288,246		0.28
1,833,518	0.33	–	0.47		9		0.40		1,833,518		0.40
1,023,112	0.35	–	0.65		10		0.40		1,013,112		0.40
19,394,972	$0.18	–	1.00		8	$	0.40		19,068,303	$	0.40

The 2007 Equity Incentive Plan [Member]

Notes Tables

Schedule of Share-based Compensation, Stock Options Plans, Activity [Table Text Block]

Date		Term		Option Shares		Exercise price		Stock price on grant date		Fair Value		Expense
June 24, 2015	(1)		10		40,000	$	0.38	$	0.38	$	15,200	$	15,200
April 20, 2015	(2)		10		700,000		0.40		0.34		238,000		59,460
September 30, 2015	(3)		10		300,000		0.57		0.57		171,000		68,400
Totals					1,040,000					$	424,200	$	143,060

Date		Term		Option Shares		Exercise Price		Stock Price on grant date		Fair Value		Expense
June 23, 2014	(1)		10		40,000	$	0.63	$	0.63	$	25,200	$	25,200
June 23, 2014	(2)		10		300,000		0.63		0.63		189,000		141,000
				$	340,000					$	214,250	$	166,200

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

									Weighted
									Average
	Options		Shares						Price per
	Outstanding		Available			Price per share			share
Balances as of December 31, 2013		8,561,086		3,438,914		$0.25	–	$1.89	$	0.44
Granted		40,000		(40,000	)		$0.28			0.28
Exercised		—		—			—			—
Expired		—		—			$—		$	—
Balances as of December 31, 2014		8,601,086		3,398,914		$0.25	–	$1.89	$	0.44
Granted		1,040,000		(1,040,000	)	$0.38	–	$0.57		0.45
Exercised		—		—			—			—
Reclassification		600,000		(600,000	)	0.30	–	0.63		0.33
Expired		—		—			—			—
Balances as of December 31, 2015		10,241,086		1,758,914		$0.25	–	$1.89	$	0.44

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

				Weighted				Currently Exercisable
				Average		Weighted
Options				Remaining		Average		Number		Weighted
Outstanding				Contractual		Exercise		Of Shares		Average
at December 31, 2015	Exercise Price			Life		Price		December 31, 2015		Exercise Price
525,000	$0.40	-	1.89		2	$	1.06		525,000		1.06
892,135	0.28	-	0.99		3		0.51		892,135		0.51
1,010,000	0.31	-	0.70		4		0.56		1,010,000		0.56
3,429,450	0.22	-	0.57		5		0.33		3,429,450		0.33
1,989,340	0.34	-	0.51		6		0.37		1,989,340		0.37
715,161	0.28	-	0.40		7		0.36		715,161		0.36
640,000	0.30	–	0.65		8		0.48		640,000		0.48
740,000	0.38	–	0.40		9		0.40		233,333		0.40
300,000		0.57			10		0.57		165,000		0.57
10,241,086	$0.22	–	1.89		4	$	0.44		9,599,419	$	0.44