Note 6 - Share-based compensation

Share-based compensation represents the cost related to share-based awards, typically stock options or stock grants, granted to employees, non-employees, officers and directors. Share-based compensation is measured at grant date, based on the estimated aggregate fair value of the award on the grant date, and such amount is charged to compensation expense on a straight-line basis (net of estimated forfeitures) over the requisite service period. For the three-month periods ended March 31, 2018 and 2017, share-based compensation expense of $27 and none, respectively, are reflected in general and administrative expenses in the consolidated Statements of Operations.

Share-based awards have historically been made as stock options, and recently also as stock grants, issued pursuant to the terms of the Company’s stock option and stock incentive plans, (collectively, the “Plans”), described below. The Plans may be administered by the Board of Directors or the Compensation Committee of the Board or by another committee appointed by the Board from among its members as provided in the Plans. Presently, the Plans are administered by the Company’s Compensation Committee of the Board of Directors. As of March 31, 2018, the Plans authorized the issuance of 6,000,000 shares of the Company’s common stock and, as of March 31, 2018 there were 2,374,722 shares of the Company’s common stock available for issuance for future stock option grants or other stock-based awards.

Stock option awards, which allow the recipient to purchase shares of the Company’s common stock at a fixed price, are typically granted at an exercise price equal to the Company’s stock price at the date of grant. Typically, the Company’s stock option awards have vested from immediately to two years from the grant date and have had a contractual term ranging from three to ten years.

Effective September 10, 2004, the Company adopted its 2004 Stock Incentive Plan (“2004 Plan”) pursuant to which 2,500,000 shares of common stock were reserved for issuance (i) upon the exercise of options, designated as either incentive stock options (“ISOs”) under the Internal Revenue Code of 1986, as amended (the “Code”) or nonqualified options, or (ii) as stock, deferred stock or other stock-based awards. ISOs could be granted under the 2004 Plan to employees and officers of the Company. Non-qualified options, stock, deferred stock or other stock-based awards could be granted to consultants, directors (whether or not they are employees), employees or officers of the Company. Stock appreciation rights could also be issued in tandem with stock options. Effective September 10, 2014, the Company’s ability to grant options or other awards under the 2004 Plan expired.

Effective August 27, 2008, the Company adopted its 2008 Stock Incentive Plan (“2008 Plan”) pursuant to which 3,000,000 shares of common stock were reserved for issuance (i) upon the exercise of options, designated as either ISOs under the Code or nonqualified options, or (ii) as stock, deferred stock or other stock-based awards. ISOs may be granted under the 2008 Plan to employees and officers of the Company. Non-qualified options, stock, deferred stock or other stock-based awards may be granted to consultants, directors (whether or not they are employees), employees or officers of the Company. Stock appreciation rights may also be issued in tandem with stock options. Unless the 2008 Plan is sooner terminated, the ability to grant options or other awards under the 2008 Plan will expire on August 27, 2018.

ISOs granted under the 2008 Plan may not be granted at a price less than the fair market value of the common stock on the date of grant (or 110% of fair market value in the case of persons holding 10% or more of the voting stock of the Company). Nonqualified options granted under the 2008 Plan may not be granted at a price less than the fair market value of the common stock. Options granted under the 2008 Plan expire not more than ten years from the date of grant (five years in the case of ISOs granted to persons holding 10% or more of the voting stock of the Company). Certain options granted may contain a barrier price whereby the options are cancelled once the stock price declines below a predetermined barrier price for five consecutive trading days.

Effective September 17, 2014, the Company adopted its 2014 Stock Incentive Plan (“2014 Plan”) pursuant to which 3,000,000 shares of common stock were reserved for issuance (i) upon the exercise of options, designated as either ISOs under the Code or nonqualified options, or (ii) as stock, deferred stock or other stock-based awards. ISOs may be granted under the 2014 Plan to employees and officers of the Company. Non-qualified options, stock, deferred stock or other stock-based awards may be granted to consultants, directors (whether or not they are employees), employees or officers of the Company. Stock appreciation rights may also be issued in tandem with stock options. Unless the 2014 Plan is sooner terminated, the ability to grant options or other awards under the 2014 Plan will expire on September 17, 2024.

ISOs granted under the 2014 Plan may not be granted at a price less than the fair market value of the common stock on the date of grant (or 110% of fair market value in the case of persons holding 10% or more of the voting stock of the Company). Nonqualified options granted under the 2014 Plan may not be granted at a price less than the fair market value of the common stock. Options granted under the 2014 Plan expire not more than ten years from the date of grant (five years in the case of ISOs granted to persons holding 10% or more of the voting stock of the Company). Certain options granted may contain a barrier price whereby the options are cancelled once the stock price declines below a predetermined barrier price for five consecutive trading days.

All stock options have been granted to employees and non-employees at exercise prices equal to or in excess of the market value on the date of the grant.

The Company determines the fair value of share-based awards at the grant date by using the Black-Scholes option-pricing model, and is incorporating the simplified method to compute expected lives of share-based awards. There were 20,000 and 0 stock options granted during the three-month periods ended March 31, 2018 and 2017, respectively.

A summary of the activity for stock options issued under the Company’s Plans for the indicated periods is presented below:

Stock Option Totals	Shares		Weighted Average Exercise Price
Outstanding at December 31, 2016		3,214,398	$	2.68
-Exercised		(1,545,161)	$	2.27
-Granted		1,400,203	$	5.72
Outstanding at December 31, 2017		3,069,440	$	4.28
-Exercised		(5,000)	$	3.43
-Granted		20,000		5.81
-Cancelled		(135,592)		6.26
Outstanding at March 31, 2018		2,948,848	$	4.20

The following is the weighted average contractual life in years and the weighted average exercise price at March 31, 2018 of:

			Weighted Average Remaining	Weighted Average
	Number of Options		Contractual Life	Exercise Price
Options outstanding and vested		2,840,848	2.14 years	$	4.14

The intrinsic values of options outstanding at March 31, 2018 and December 31, 2017 are $3.2 million and $5.5 million, respectively.

The intrinsic value of options unvested at March 31, 2018 and December 31, 2017 are approximately $0 and $0, respectively.

The intrinsic value of options vested and exercised during the three months ended March 31, 2018 and 2017 were $13,950 and $260,747, respectively.