Debt and Shareholders' Equity (Details Narrative) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Oct. 31, 2017	Apr. 30, 2017	Dec. 31, 2016
Debt And Shareholders Equity Details Narrative
Outstanding borrowings under revolving loan agreement		$ 45,969	$ 45,969				$ 32,936
Credit facility borrowing capacity		$ 55,000	$ 55,000		$ 50,000	$ 55,000
Interest rate of LIBOR plus percentage	2.00%
Credit facility interest rate	Interest rate of LIBOR plus 2.0%
Facility fee per annum	0.20%
Credit facility expiration date	May 06, 2019
Common stock issued upon exercise of employee stock options (in shares)		2,108	49,106
Cash received upon exercise of employee stock options		$ 21	$ 649
Cash paid to settle employee stock options		$ 28	$ 760	$ 1,700