Note 13 - Employee Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

	Number of options			Weighted average exercise price (per share)		Weighted average remaining contractual term (in years)		Aggregate intrinsic value
Outstanding at December 31, 2014		3,130,000		$	0.20		1.59	$	364,900
Granted		225,000			0.25
Exercised		(292,500	)		0.12
Forfeited/cancelled/expired		(1,060,000	)		0.35
Outstanding at December 31, 2015		2,002,500			0.14		1.40	$	198,990
Granted		450,000			0.20
Exercised		(1,120,000	)		0.12
Forfeited/cancelled/expired		(107,500	)		0.29
Outstanding at December 31, 2016		1,225,000		$	0.17		2.62	$	83,425
Vested and exercisable at December 31, 2016		737,500		$	0.15		1.38	$	64,550

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]

Fair value of options vesting  for the year ended	Number of options vested	Fair value of options vested
December 31, 2016	162,500	$	33,622
December 31, 2015	200,000	$	34,665

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

Awards breakdown by price range at December 31, 2016
			Outstanding						Vested
Strike price range ($)			Outstanding stock options		Weighted average remaining contractual life		Weighted average outstanding strike price		Vested stock options		Weighted average remaining vested contractual life		Weighted average vested strike price
0.00	to	0.20		850,000		2.15	$	0.15		625,000		1.32	$	0.14
0.21	to	0.29		375,000		3.70		0.23		112,500		1.67		0.21
0.30	to	0.49		-0-		0.00		0.00		-0-		0.00		0.00
0.50	to	0.70		-0-		0.00		0.00		-0-		0.00		0.00
0.00	to	0.70		1,225,000		2.62	$	0.17		737,500		1.38	$	0.15

Awards breakdown by price range at December 31, 2015
			Outstanding						Vested
Strike price range ($)			Outstanding stock options		Weighted average remaining contractual life		Weighted average outstanding strike price		Vested stock options		Weighted average remaining vested contractual life		Weighted average vested strike price
0.00	to	0.20		1,777,500		1.14	$	0.13		1,652,500		0.93	$	0.13
0.21	to	0.29		125,000		2.83		0.22		100,000		2.46		0.21
0.30	to	0.49		100,000		4.17		0.30		-0-		0.00		0.00
0.50	to	0.70		-0-		0.00		0.00		-0-		0.00		0.00
0.00	to	0.70		2,002,500		1.40	$	0.14		1,752,500		1.02	$	0.13

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

	Stock option assumptions for the year ended
Stock option assumptions	December 31, 2016	December 31, 2015
Risk-free interest rate	1.45%	1.20%
Expected dividend yield	0.0%	0.0%
Expected volatility	155.5%	183.8%
Expected life of options (in years)	5	5

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

	Weighted average grant date fair value
	for the year ended December 31,
	2016		2015
Stock options granted during the period	$	0.19	$	0.24
Stock options vested during the period	$	0.21	$	0.17
Stock options forfeited during the period	$	0.28	$	0.26

Schedule of Nonvested Share Activity [Table Text Block]

	Shares underlying stock options		Weighted average grant date fair value
Nonvested shares atJanuary 1, 2016		250,000	$	0.23
Nonvested shares atDecember 31, 2016		487,500	$	0.20