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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 66,000 | $ 68,000
Reserves not deductible until paid | 4,000 | 55,000
Net operating loss carryforwards |  |
Federal | 2,168,000 | 2,170,000
State | 883,000 | 816,000
Federal tax credit | 877,000 | 733,000
Operating lease liabilities | 402,000 | 416,000
Other | 92,000 | 69,000
Gross deferred tax assets | 4,492,000 | 4,327,000
Less valuation allowance | (2,351,000) | (2,269,000)
Deferred tax assets net of valuation allowance | 2,141,000 | 2,058,000
Deferred tax liabilities: |  |
Property and equipment | (1,731,000) | (1,552,000)
Operating lease right of use assets | (402,000) | (416,000)
Other | 0 | (82,000)
Gross deferred tax liabilities | (2,133,000) | (2,050,000)
Net deferred tax asset | $ 8,000 | $ 8,000

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