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Note 5 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carry forwards $ 1,357 $ 1,313
Federal Research and Development Credit 240 240
Deferred revenue 109 360
Accrued payroll 73
Allowance for doubtful accounts and other receivable 36 59
Share-based compensation expense 545 646
Foreign subsidiaries 733 588
Depreciation 396 360
Other 439 26
Federal Alternative Minimum Tax 156
Valuation allowance (292)
Total deferred tax assets 3,636 3,748
Deferred tax liabilities:    
Goodwill 76 224
Intangible assets of subsidiaries 513
Capitalized software development costs 479 469
Total deferred tax liabilities 1,068 693
Net deferred taxes $ 2,568 $ 3,055