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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 65,000 | $ 66,000
Reserves not deductible until paid | 7,000 | 4,000
Net operating loss carryforwards |  |
Federal | 2,081,000 | 2,168,000
State | 494,000 | 883,000
Federal tax credit | 1,041,000 | 877,000
Operating lease liabilities | 345,000 | 402,000
Section 163(j) business interest expense carryforward | 269,000 | 0
Other | 37,000 | 92,000
Gross deferred tax assets | 4,339,000 | 4,492,000
Less valuation allowance | (2,488,000) | (2,351,000)
Deferred tax assets net of valuation allowance | 1,851,000 | 2,141,000
Deferred tax liabilities: |  |
Property and equipment | (1,498,000) | (1,731,000)
Operating lease right of use assets | (345,000) | (402,000)
Gross deferred tax liabilities | (1,843,000) | (2,133,000)
Net deferred tax asset | $ 8,000 | $ 8,000

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