Note 4 - Equity Impact from Changes of Ownership in Connect (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Connect [Member]
Connect net loss attributable to NRC	$ (533,000)	$ (1,488,000)	$ (837,000)
Acquisition of non-controlling interest	(2,789,000)
Change to NRC equity resulting from Connect net loss and acquisitions of non-controlling interest	(3,322,000)	$ (1,488,000)	$ (837,000)
Acquisition of non-controlling interest	$ (2,789,000)