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Significant components of our deferred income taxes consist of the following: (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax liabilities: |  |
Excess tax basis convertible debt |  | $ (257)
Total deferred tax liabilities |  | (257)
Deferred tax assets: |  |
Net operating loss carryforwards | 14,566 | 15,597
Inventory and other allowances | 148 | 23
Charitable contribution & other carryforwards |  | 9
Excess (tax) book depreciation | 31 | 375
Excess (tax) book amortization | 63 | 61
Share-based compensation | 308 | 624
Other accrued costs | 161 | 138
Total deferred tax assets | 15,277 | 16,827
Less: Valuation allowance | (15,277) | (16,570)
Deferred income taxes |  |

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