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1. Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Warrants outstanding	2,000,000
Stock based compensation costs	$ 1,186	$ 1,394
Unrecognized stock-based compensation costs	$ 4,500
Unrecognized stock-based compensation costs amortization period	1 year 8 months 12 days
Aggregate intrinsic value outstanding	$ 7,700
Aggregate intrinsic value exercisable	$ 7,300
Options Exercised	308,000	279,000
Total intrinsic value of options exercised	$ 849	$ 913
Shares available for future grants	2,400,000

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Number of warrants or rights outstanding.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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