(7) Shareholders' Equity (Details - Option activity) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Options outstanding at the beginning of period	15,348
Options outstanding at the beginning of period	$ 4.59
Granted	1,600
Granted	$ 2.47
Exercised	(558)
Exercised	$ 1.70
Forfeited/Expired	(413)
Forfeited/Expired	$ 5.13
Options outstanding at the end of period	15,977
Options outstanding at the end of period	$ 4.46
Weighted average remaining contractual term, end of period	2 years 10 months 6 days
Options exercisable at the end of period	12,597	11,717
Options exercisable at the end of period	$ 4.81
Weighted average remaining contractual term, exercisable at the end of period	2 years 1 month 24 days