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Riley Securities, Inc B. Riley Securities, Inc [Member] B. 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Holtec Power, Inc. [Member] Holtec Power, Inc. Issuance of contingently issuable common stock (in shares) Stock Issued During Period, Shares, Contingently Issuable Stock Stock Issued During Period, Shares, Contingently Issuable Stock Common stock, shares issued (in shares) Common Stock, Shares, Issued Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued City Area Code City Area Code Investment in unconsolidated joint venture Equity Method Investments and Joint Ventures Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Entity Address, City or Town Entity Address, City or Town Repayment of other financing Repayments of Other Debt Hellman Parties Hellman Parties [Member] Hellman Parties Intangible Assets Intangible Assets Disclosure [Text Block] Useful lives Property, Plant and Equipment, Useful Life Operating lease liability, long-term Operating Lease, Liability, Noncurrent Total minimum lease payments Finance Lease, Liability, Payment, Due Principal Debt Instrument, Face Amount 2023 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