2. Investments (Details Narrative)	12 Months Ended
	Dec. 31, 2018
Corporate Bond Securities [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Securities maturity length	14 months
Corporate Bond Securities [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Securities maturity length	29 months 15 days
Certificates of deposit [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Securities maturity length	24 days
Certificates of deposit [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Securities maturity length	6 months 12 days