Note 8 - Notes Payable - Summary of Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total notes payable	$ 1,067	$ 3,540
Less current portion	1,067	2,683
Note payable, net of current portion		857
Revolving Credit Note [Member]
Total notes payable
Term Note [Member]
Total notes payable	$ 1,067	$ 3,540