Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss carry forwards	$ 1,313	$ 3,116
Federal Research and Development Credit	240	281
Deferred revenue	360	419
Allowance for doubtful accounts and other receivable	59	49
Share-based compensation expense	646	763
Foreign subsidiaries	588	471
Depreciation	360	529
Other	26	38
Federal Alternative Minimum Tax	156	116
Total deferred tax assets	3,748	5,782
Deferred tax liabilities:
Goodwill	224	307
Capitalized software development costs	469	781
Total deferred tax liabilities	693	1,088
Net deferred taxes	$ 3,055	$ 4,694