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Significant components of our deferred income taxes consist of the following: (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax liabilities: |  |
Excess tax depreciation | $ (253) |
Total deferred tax liabilities | (253) |
Deferred tax assets: |  |
Net operating loss carryforwards | 13,416 | 14,566
179 Carryforwards | 117 |
163(j) Business interest limitation carryforwards | 98 |
Deferred revenue | 202 |
Inventory and other allowances | 177 | 148
Excess (tax) book depreciation |  | 31
Excess (tax) book amortization | 59 | 63
174 research & experimental expenditures | 480 |
Share-based compensation | 394 | 308
Other accrued costs | 238 | 161
Total deferred tax assets | 15,181 | 15,277
Less: Valuation allowance | (14,928) | (15,277)
Deferred income taxes |  |

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