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Income Taxes - Deferred Income Taxes (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Net operating loss carry forwards $ 24,823,000 $ 23,877,000
Accrued expenses 368,000 430,000
Stock option and warrant expenses 618,000 504,000
Accounts receivable 39,000 41,000
Other 180,000 (42,000)
Total deferred tax assets 26,028,000 24,810,000
Valuation allowance (25,921,000) (24,684,000)
Net deferred tax assets 107,000 126,000
Deferred tax liabilities:    
Fixed and tangible assets (107,000) (126,000)
Total deferred tax liabilities 107,000 126,000
Total deferred tax assets (liabilities) $ 0 $ 0