Note 13 - Employee Equity Incentive Plans (Tables)

6 Months Ended

Jun. 30, 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		-0-			-0-
Exercised		(1,012,500	)		0.13
Forfeited/cancelled/expired		(7,500	)		0.13
Outstanding at June 30, 2016		982,500		$	0.16		1.99	$	57,088
Vested and exercisable at June 30, 2016		845,000		$	0.15		1.70	$	54,938

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 six months ended	Number of options vested		Fair value of options vested
June 30, 2016		112,500	$	25,153
June 30, 2015		125,000	$	22,235

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

Awards breakdown by price range at June 30, 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		757,500		1.72	$	0.13		682,500		1.48	$	0.13
0.21	to	0.29		125,000		2.33		0.22		112,500		2.17		0.21
0.30	to	0.49		100,000		3.67		0.30		50,000		3.67		0.30
0.50	to	0.70		-0-		0.00		0.00		-0-		0.00		0.00
0.00	to	0.70		982,500		1.99	$	0.16		845,000		1.70	$	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 period ended
Stock option assumptions	June 30, 2016		December 31, 2015
Risk-free interest rate		1.30%		1.20%
Expected dividend yield		0.0%		0.0%
Expected volatility		157.6%		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 six months ended June 30,
	2016		2015
Stock options granted during the period	$	-0-	$	0.26
Stock options vested during the period	$	0.22	$	0.18
Stock options forfeited during the period	$	0.11	$	0.25

Schedule of Nonvested Share Activity [Table Text Block]

	Shares underlying stock options		Weighted average grant date fair value
Nonvested shares at January 1, 2016		250,000	$	0.22
Nonvested shares at June 30, 2016		137,500	$	0.22