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1. Summary of Significant Accounting Policies (Details - Stock purchases) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Open market purchases	231,181	561,617
Average price for open market purchases	$ 3.86	$ 4.94
Shares redeemed upon net exercise of stock options	33,599	25,193
Average price for shares redeemed upon net exercise of stock options	$ 4.37	$ 5.04
Other purchases	90,000	0
Average price for other stock purchases	$ 4.13
Total stock purchases	354,780	586,810
Average price for total stock purchases	$ 3.97	$ 4.94

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Average price for open market purchases

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Average price for other stock purchases

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Average price for shares redeemed upon net exercise of stock options

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Shares redeemed upon net exercise of stock options

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Number of shares that have been repurchased during the period in the open market.

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Number of shares that have been repurchased- other purchases

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
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