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Note 16 - Income Tax - Deferred Income Tax Components (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loss carry-forwards | $ 1,441 | $ 2,788
Expenses not currently deductible | 39,415 | 23,283
Stock-based compensation |  | 749
Allowance for doubtful accounts | 5,535 | 3,860
Inventory and other reserves | 865 | 3,024
Deferred Tax Assets, Gross, Total | 47,256 | 33,704
Depreciation and amortization | 83,676 | 86,072
Basis differences of partnerships and other entities | 769 | 793
Prepaid and other expenses deducted for tax purposes | 1,505 | 1,276
Deferred Tax Liabilities, Gross, Total | 85,950 | 88,141
Net deferred income tax asset (liability) before valuation allowance | (38,694) | (54,437)
Valuation allowance | 603 | 965
Net deferred income tax asset (liability) | $ (39,297) | $ (55,402)

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