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INCOME TAXES - Tax effects of temporary differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Accrued expenses $ 10 $ 34
Lease liability 1,721 1,109
Accounts receivable 18 19
Inventory 495 232
Stock based compensation 306 145
Tax Credits and NOL Carryforward 20 110
Other 1 1
Amortization 43 50
Total deferred tax assets 2,614 1,700
Deferred tax assets 2,614 1,700
Deferred tax Liabilities:    
Property and equipment (470) (192)
Finance lease (78) (45)
Right-of-use asset (1,480) (946)
Prepaid Expenses (20) (4)
Deferred tax liabilities (2,048) (1,187)
Net Deferred tax assets $ 566 $ 513