Leases (Details-2) - USD ($)	Dec. 31, 2020		Dec. 31, 2019
Lessee Disclosure [Line Items]
Total lease assets	$ 21,670,000		$ 16,566,000
Finance lease liabilities - long term	17,532,000		17,379,000
Property, plant, and equipment, net [Member]
Lessee Disclosure [Line Items]
Finance lease assets, net	15,682,000		15,895,000
Other deferred assets and other [Member]
Lessee Disclosure [Line Items]
Operating lease assets	5,988,000		671,000
Other Current Liabilities [Member]
Lessee Disclosure [Line Items]
Finance lease liabilities - current	1,066,000		888,000
Operating lease liabilities - current	171,000		203,000
Other deferred liabilities and other [Member]
Lessee Disclosure [Line Items]
Operating lease liabilities - long term	5,840,000	[1]	496,000
Other Liabilities [Member]
Lessee Disclosure [Line Items]
Total lease liabilities	$ 24,609,000		$ 18,966,000

[1] Increase in operating lease assets and long-term operating lease liabilities related to land leases for new solar farms in 2020.