Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for doubtful accounts	$ 46	$ 62
Accrued expenses	416	580
Share based compensation	1,457	2,357
Accrued bonuses	113	84
Foreign tax credit from repatriation	535
Other	166	244
Gross deferred tax assets	2,733	3,327
Less Valuation Allowance	(535)
Deferred Tax Assets	2,198	3,327
Deferred tax liabilities:
Prepaid expenses	169	270
Property and equipment	856	1,206
Intangible assets	4,497	6,521
Repatriation withholding	706
Deferred tax liabilities	6,228	7,997
Net deferred tax liabilities	$ (4,030)	$ (4,670)