Note 4 - Investments - Unaudited Summarized Financial Information for NKD Enterprises, LLC - Operations (Details) - NKD Enterprises LLC [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revenues	$ 2,050	$ 1,878
Operating loss	(168)	(58)
Net loss	(168)	(58)
Current assets	107	133
Non-current assets	3,002	3,004
Current liabilities	400	260
Stockholders’ equity	$ 2,709	$ 2,877