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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 68,000 | $ 71,000
Reserves not deductible until paid | 55,000 | 154,000
Net operating loss carryforwards |  |
Federal | 2,170,000 | 1,646,000
State | 816,000 | 749,000
Federal tax credit | 733,000 | 653,000
Business interest expense carryforward |  | 235,000
Operating lease liabilities | 416,000 |
Other | 69,000 | 115,000
Gross deferred tax assets | 4,327,000 | 3,623,000
Less valuation allowance | (2,269,000) | (2,043,000)
Deferred tax assets net of valuation allowance | 2,058,000 | 1,580,000
Deferred tax liabilities: |  |
Property and equipment | (1,552,000) | (1,517,000)
Operating lease right of use assets | (416,000) |
Other | (82,000) | (55,000)
Gross deferred tax liabilities | (2,050,000) | (1,572,000)
Net deferred tax asset | $ 8,000 | $ 8,000

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