Note 4 - Acquisition - Pro Forma Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gross revenue		$ 83,275	$ 86,461	$ 86,240	$ 76,045
Total expenses				92,227	78,846
Net loss		$ (12,589)	$ (7,266)	(5,987)	(2,801)
Nonrecurring Adjustment [Member]
Total expenses	[1]			31	186
Pro Forma [Member]
Gross revenue				91,077	92,539
Total expenses				97,470	96,836
Net loss				(6,393)	(4,297)
Tectrol, Inc. [Member]
Gross revenue				4,837	16,494
Total expenses				5,212	17,804
Net loss				$ (375)	$ (1,310)

[1] Adjustment to recognize the estimated depreciation and amortization expense for each of the presented periods assuming amortization of the intangible assets and depreciation of tangible assets over their estimated useful lives. Estimated depreciation and amortization for the unaudited pro forma condensed consolidated statements of operations are $31 thousand and $0.2 million for 2015 and 2014, respectively.