Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts	$ 62	$ 58
Accrued expenses	580	578
Share based compensation	2,357	1,796
Accrued bonuses	84	618
Other	53	94
Deferred tax assets	3,136	3,144
Prepaid expenses	270	261
Property and equipment	1,206	943
Intangible assets	6,521	7,616
Other		68
Deferred tax liabilities	7,997	8,888
Net deferred tax liabilities	$ (4,861)	$ (5,744)