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Note 18 - Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Compensation and benefit accruals $ 328,000 $ 386,000
Inventory valuation 863,000 877,000
Federal and state net operating loss carryforwards 35,351,000 33,851,000
Deferred revenue 21,000 391,000
Accounts receivable allowance 15,000 7,000
Defined benefit pension plan 621,000 708,000
Lease liabilities 1,037,000 1,193,000
Foreign deferred revenue and other provisions 2,548,000 3,604,000
Other 779,000 718,000
Total 41,563,000 41,735,000
Domestic valuation allowance (37,441,000) (37,015,000)
Total deferred tax assets 4,122,000 4,720,000
Deferred tax liabilities:    
Depreciation (714,000) (114,000)
Right-of-use assets, net (860,000) (1,002,000)
Total deferred tax liabilities (1,574,000) (1,116,000)
Net deferred tax asset $ 2,548,000 $ 3,604,000