(7) Shareholders' Equity (Details - Options outstanding and exercisable) - shares shares in Thousands	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	15,977	15,348
Number of shares, exercisable	12,597	11,717
$0.95 - $1.99 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,904	2,436
Number of shares, exercisable	1,904	2,436
$2.00 - $2.99 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,570	0
Number of shares, exercisable	180	0
$3.00 - $3.99 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	4,973	5,145
Number of shares, exercisable	3,306	2,158
$4.00 - $4.99 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,540	1,547
Number of shares, exercisable	1,217	903
$5.00 - $5.99 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	0	0
Number of shares, exercisable	0	0
$6.00 - $6.99 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	4,770	4,955
Number of shares, exercisable	4,770	4,955
$7.00 - $7.99 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares, outstanding	1,220	1,265
Number of shares, exercisable	1,220	1,265

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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