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Note 5 - Disposal and Discontinued Operations - Financial Information From Discontinued Operations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Non-operating other revenue $ (13,000)  
Non-operating other expense   $ 154,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax (1,988,000) (2,262,000)
Discontinued Operations, Disposed of by Sale [Member] | Leased Real Estate [Member]    
Cash and cash equivalents 612,000 570,000
Property and equipment, net 16,171,000 16,160,000
Intangible assets, net 2,748,000 2,748,000
Loss on write-down of disposal group (1,779,000) 0
Assets held for sale 17,752 19,478
Accrued expenses and other liabilities 885,000 473,000
Notes payable 15,229,000 16,112,000
Disposal Group, Including Discontinued Operation, Liabilities, Total 16,114,000 16,585,000
Discontinued Operations, Held-for-Sale or Disposed of by Sale [Member] | Leased Real Estate [Member]    
Rental revenue 1,251,000 14,567,000
Total revenues 1,251,000 14,567,000
Cost of services sold 199,000 204,000
General and administrative expenses 254,000 20,778,000
Leased real estate segment interest expense 361,000 6,387,000
Amortization of intangible assets 0 206,000
Total expenses 801,000 27,729,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax 450,000 (13,162,000)
Income tax benefit 0 (357,000)
Income (loss) from discontinued operations, net of taxes 450,000 (12,805,000)
Discontinued Operations, Held-for-Sale or Disposed of by Sale [Member] | Leased Real Estate and Mendota [Member]    
Loss on disposal of discontinued operations before income tax benefit (1,988,000) (26,751,000)
Income tax benefit 0 (24,489,000)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax $ (1,988,000) $ (2,262,000)