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Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:        
Tax intangibles basis greater than book basis $ 722 $ 722    
Allowance for doubtful accounts 50 76    
Unearned income 2,768 2,769    
Federal and state net operating losses 15,967 16,452    
Capital loss carryforward 511 525    
Accrued expenses 761 1,133    
Other 7 4    
Total deferred tax asset 20,786 21,681    
Valuation allowance (16,169) (18,627) $ (17,343) $ (14,938)
Net deferred tax asset 4,617 3,054    
Deferred tax liabilities:        
Other (6) (52)    
Tax property basis greater/(less) than book basis (5,932) (2,935)    
Prepaid expenses 0 (59)    
Total deferred tax liability (5,938) (3,046)    
Net deferred tax asset (liability) $ (1,321)      
Net deferred tax asset (liability)   $ 8