Note 9 - Equity Method Investment - TEL's Summarized Financial Information - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue	$ 23,712	$ 23,508	$ 46,245	$ 43,199
Operating Expenses	20,516	20,817	40,314	37,204
Operating Income	3,196	2,691	5,931	5,995
Net Income	$ 2,023	$ 1,610	$ 3,689	$ 3,812