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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:        
Net loss $ (998,000) $ (849,000) $ (4,407,000) $ (7,255,000)
Adjustments to reconcile net loss to net cash used by operating activities:        
Deferred tax benefit     (621,000)
Impairment of other investments     4,100,000
Depreciation and amortization 280,000 280,000 1,120,000 1,113,000
Decrease (increase) in assets:        
Other receivables     (128,000)
Prepaid expenses and other current assets (2,000) (79,000) 104,000 (60,000)
Increase (decrease) in liabilities:        
Accounts payable 191,000 (353,000) 293,000 424,000
Accrued expenses (183,000) (13,000) 167,000 57,000
Net cash used by operating activities (712,000) (1,014,000) (2,851,000) (2,242,000)
Cash flows from investing activities:        
Purchase of investment     (65,000)
Purchase of property, plant and equipment (5,000) (18,000) (276,000)
Note receivable investment, net 1,000 3,000 (8,000)
Net cash used by investing activities (4,000) (15,000) (349,000)
Cash flows from financing activities:        
Borrowings of long-term debt 713,000 1,017,000    
Borrowings from note payable, related party     2,865,000 2,547,000
Net cash provided by financing activities 713,000 1,017,000 2,865,000 2,547,000
Net decrease in cash 1,000 (1,000) (1,000) (44,000)
Cash and cash equivalents at beginning of year 1,000 2,000 2,000 46,000
Cash and cash equivalents at end of year $ 2,000 $ 1,000 $ 1,000 $ 2,000