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1. Summary of Significant Accounting Policies (Details - Earnings per share) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings per share:
Numerator for basic and diluted earnings per share	$ 8,010us-gaap_NetIncomeLoss	$ 7,776us-gaap_NetIncomeLoss	$ 7,026us-gaap_NetIncomeLoss	$ 6,705us-gaap_NetIncomeLoss	$ 6,522us-gaap_NetIncomeLoss	$ 5,873us-gaap_NetIncomeLoss	$ 4,825us-gaap_NetIncomeLoss	$ 3,785us-gaap_NetIncomeLoss	$ 64,828us-gaap_NetIncomeLoss	$ 2,728us-gaap_NetIncomeLoss	$ 1,341us-gaap_NetIncomeLoss	$ 512us-gaap_NetIncomeLoss	$ 29,516us-gaap_NetIncomeLoss	$ 21,005us-gaap_NetIncomeLoss	$ 69,408us-gaap_NetIncomeLoss
Denominator for basic earnings per share - weighted average number of common shares outstanding during the year													25,040,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	21,538,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,473,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental common shares attibutable to exercise of outstanding options and warrants													6,992,000us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	10,036,000us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	6,005,000us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Denominator for diluted earnings per share													32,032,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	31,574,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	25,478,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic	$ 3.30us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic	$ 1.18us-gaap_EarningsPerShareBasic	$ 0.98us-gaap_EarningsPerShareBasic	$ 3.56us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 2.20us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.92us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 2.72us-gaap_EarningsPerShareDiluted

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