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13. STOCK-BASED COMPENSATION (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation [Abstract] |  |
Number of Option and Warrants Outstanding, Beginning balance | 185,000 | 2,399,000
Number of Option and Warrants Outstanding, Granted | 661,000 | 80,000
Number of Option and Warrants exercised in period | 0 | (1,831,500)
Number of Option and Warrants expired | (37,500) | (462,500)
Number of Option and Warrants Outstanding, Ending Balance | 808,500 | 185,000
Weighted- Average Exercise price of Option and Warrants, outstanding beginning of period | $ 2.19 | $ 1.39
Weighted- Average Exercise price of Option and Warrants, granted in period | 1.47 | 1.87
Weighted- Average Exercise price of Option and Warrants, exercised in period | 0.00 | 1.11
Weighted- Average Exercise price of Option and Warrants, expired in period | 2.18 | 2.24
Weighted- Average Exercise price of Option and Warrants, outstanding end of period | $ 1.61 | $ 2.19
Range of Exercise Price per Common Share, Beginning Balance | $1.54 - $4.80 | 0.95 - $12.60
Range of Exercise Price per Common Share, Granted and Vested | $1.44 - $1.98 | $1.45 - $2.17
Range of Exercise Price per Common Share, Exercised | $ 0.00 | $ 1.11
Range of Exercise Price per Common Share, Expired | $1.83-$2.55 | $0.95 - $12.60
Range of Exercise Price per Common Share, Ending Balance | $1.44 - $4.80 | $1.54 - $4.80

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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