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Note 19 - Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Compensation and benefit accruals $ 386,000 $ 359,000
Inventory valuation 877,000 866,000
Federal and state net operating loss carryforwards 33,851,000 32,470,000
Deferred revenue 391,000 975,000
Accounts receivable allowance 7,000 8,000
Depreciation 0 85,000
Defined benefit pension plan 708,000 591,000
Lease liabilities 1,193,000 1,334,000
Foreign deferred revenue and other provisions 3,604,000 4,054,000
Other 718,000 661,000
Total 41,735,000 41,403,000
Domestic valuation allowance (37,015,000) (36,217,000)
Foreign valuation allowance 0 (3,717,000)
Total deferred tax assets 4,720,000 1,469,000
Deferred tax liabilities:    
Depreciation (114,000) 0
Right-of-use assets, net (1,002,000) (1,132,000)
Total deferred tax liabilities (1,116,000) (1,132,000)
Net deferred tax asset $ 3,604,000 $ 337,000