Summary of Significant Accounting Policies (Details-2) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents	$ 17,438	$ 44,738
Restricted cash	847	644
Receivable - margin account	550	1,657
Cash, cash equivalents, and restricted cash	18,835	47,039	$ 25,814	$ 84,929
MGE [Member]
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents	6,401	4,103
Restricted cash	847	644
Receivable - margin account	550	1,657
Cash, cash equivalents, and restricted cash	$ 7,798	$ 6,404	$ 5,529	$ 6,670