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CAPITAL STOCK (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of weighted average valuation assumptions

The fair value of each option grant was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions for options granted in the three months ended March 31, 2018 and 2017.



	Three Months Ended March 31,
	2018	2017
Risk-free interest rate	2.64%	1.87%
Expected lives	4.9 years	4.9 years
Expected volatility	40%	40%
Expected dividend yield	0%	0%

Schedule of stock options plans

A summary of our stock option plans, excluding options to purchase fractional shares resulting from our December 2010 1-for-10 reverse stock split, is as follows:



	Three Months Ended March 31,				Year Ended December 31,
	2018				2017
	Options		Weighted Average Exercise Price		Options		Weighted Average Exercise Price
Outstanding at beginning of period	630,847		$	29.312	829,617		$	23.203
Granted at market	130,000		$	69.770	27,050		$	99.087
Canceled	(18,706	)	$	52.131	(18,331	)	$	57.197
Exercised	(6,683	)	$	18.089	(207,489	)	$	11.520
Outstanding at end of period	735,458		$	35.985	630,847		$	29.312
Exercisable at end of period	470,717		$	19.584	456,802		$	18.316

Schedule of shares authorized under stock options plans by exercise price

The following table summarizes information about stock options outstanding and exercisable at March 31, 2018:



	Options Outstanding				Options Exercisable
Exercise Prices	Number of Options Outstanding at March 31, 2018	Weighted Average Remaining Contractual Life in Years	Weighted Average Exercise Price		Number of Options Exercisable at March 31, 2018	Weighted Average Exercise Price
$ 4.40 - $ 6.90	94,451	2.40	$	5.382	94,451	$	5.382
$ 6.91 - $ 8.55	168,628	5.15	$	7.759	168,628	$	7.759
$ 8.56 - $39.56	143,957	6.57	$	22.445	125,721	$	22.747
$39.57 - $69.77	215,217	8.90	$	57.940	47,469	$	39.840
$69.78 - $108.25	113,205	8.57	$	79.042	34,448	$	76.947
$ 4.40 - $108.25	735,458	6.73	$	35.985	470,717	$	19.584

Schedule of pricing models

The weighted average assumptions used for the periods presented were as follows:



	Three Months Ended March 31,
	2018	2017
Risk-free interest rate	1.03%	0.64%
Expected lives	1.2 years	1.2 years
Expected volatility	44%	45%
Expected dividend yield	0%	0%

- Definition

Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

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