Note 14 - Revenue and Assets by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
UNITED STATES
Revenues	$ 97,097	$ 92,270	$ 85,863
Long-lived assets	70,624	73,328	71,139
Total assets	116,530	115,730	98,074
CANADA
Revenues	5,246	6,567	6,727
Long-lived assets	2,364	2,994	3,383
Total assets	12,569	13,780	13,014
Revenues	102,343	98,837	92,590
Long-lived assets	72,988	76,322	74,522
Total assets	$ 129,099	$ 129,510	$ 111,088