Note 8. Stock Options and Restricted Stock Units (Tables)

12 Months Ended

Dec. 31, 2015

Notes to Financial Statements

Summary of stock options issued

	Number of Options Outstanding			Range of Exercise Price		Weighted Average Exercise Price		Aggregate Intrinsic Value
Balance at December 31, 2013		280,836		$	0.01 - $8.25	$	4.97	$	1,340,684
Options granted		54,000		$	9.26 - $13.49	$	12.39		-
Options exercised		(76,665	)	$	0.01 - $7.76	$	2.23	$	646,266
Balance at December 31, 2014		258,171		$	0.01 - $13.49	$	7.32	$	608,750
Options granted		10,000		$	6.80	$	6.80		-
Options exercised		(20,671	)	$	0.01 - $2.81	$	2.55	$	106,868
Options forfeited		(1,500	)	$	9.26	$	9.26		-
Balance at December 31, 2015		246,000		$	0.01 - $13.49	$	7.69	$	187,798

Schedule Of Stock Options

		Options Outstanding						Options Exercisable
Exercise Price		Number		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in Years)		Number
$	0.01 - $1.00		19,700	$	0.01		6.06		19,700
$	1.01 - $2.00		4,550	$	1.70		5.40		4,550
$	2.01 - $3.00		6,500	$	2.65		2.23		1,500
$	3.01 - $4.00		14,000	$	3.33		6.25		14,000
$	4.01 - $8.00		108,750	$	7.67		5.74		55,001
$	8.01 - $9.00		40,000	$	8.25		2.64		25,000
$	9.01 - $10.00		12,500	$	9.26		8.99		3,125
$	10.01-$13.49		40,000	$	13.49		3.19		17,500
Total			246,000	$	7.69		4.94		140,376

Schedule of Stock Options, Valuation Assumptions

	Year ended  December 31, 2015			Year ended  December 31, 2014
Expected dividend yield		1.76	%		0.33	%
Expected stock price volatility		158	%		161	%
Weighted-average risk-free interest rate		1.84	%		1.32	%
Weighted-average expected life of options (in years)		5.97			4.5