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Note 5 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets, Operating Loss Carryforwards, Total | $ 1,158 | $ 2,875
Federal Research and Development Credit | 240 | 240
Deferred revenue |  | 43
Accrued payroll |  | 88
Payroll taxes payable | 328 |
Outside basis in domestic partnership | 92 |
Allowance for doubtful accounts and other receivable | 77 | 18
Share-based compensation expense | 434 | 524
Foreign subsidiaries | 2,978 | 932
Depreciation | 16 | 573
Right to use assets | 3,049 | 1,730
Other | 315 | 485
Valuation allowance | (397) | (2,511)
Total deferred tax assets | 8,290 | 4,997
Goodwill & Intangible assets of subsidiaries | 558 | 879
Capitalized software development costs | 482 | 505
Right To Use Liabilities | 3,049 | 1,730
Total deferred tax liabilities | 4,089 | 3,114
Net deferred taxes | $ 4,201 | $ 1,883

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