9. Stock Options (Details - Options by exercise price) - shares	Dec. 31, 2017	Dec. 31, 2016
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices of options outstanding	133,002	153,164
$2.70 - $4.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices of options outstanding	23,563	22,725
$5.00 - $9.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices of options outstanding	22,439	16,439
$10.00 - $10.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices of options outstanding	23,000	38,000
$11.00 - $12.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices of options outstanding	40,500	40,500
$13.00 - $18.22 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices of options outstanding	23,500	35,500