Commitments and Contingencies (Details-4)	12 Months Ended
	Dec. 31, 2018 USD ($)
Other Commitments [Line Items]
Other commitments, due in 2019	$ 333,000
Other commitments, due in 2020	333,000
Other commitments, due in 2021	333,000
Other commitments, due in 2022	333,000
Other commitments, due in 2023	333,000
Other commitment, due thereafter	3,665,000
Investments in Non Public Entities, Capital Infusions [Member]
Other Commitments [Line Items]
Other commitment, initial agreed upon commitment total	$ 11,400,000
Venture Debt Fund [Member]
Other Commitments [Line Items]
Other commitment, contract term, expiring in 2019	3 years
Other commitment, initial agreed upon commitment total	$ 1,500,000
Other commitments, total as of balance sheet date	$ 600,000