Note 13 - Summary of Selected Unaudited Quarterly Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015
Revenues	$ 7,233	$ 7,566	$ 6,088	$ 5,766	$ 5,262	$ 4,686	$ 5,094	$ 3,468	$ 26,653	[1]	$ 18,510	[1]
Gross Profit	961	1,792	1,354	1,511	493	1,401	1,530	848	5,618		4,272
Allocation of net loss	$ (853)	$ (17)	$ (497)	$ (629)	$ (1,389)	$ (216)	$ 71	$ (658)	$ (1,996)		$ (2,192)
Net Income per Class A Unit (in dollars per share)	$ (0.08)		$ (0.04)	$ (0.06)	$ (0.13)	$ (0.02)	$ 0.01	$ (0.06)	$ (0.18)		$ (0.21)

[1] All revenues are from sources within the United States of America, Canada and Asia.