Note 11 - Purchase of Interests in Subsidiaries (Detail) - Pro Forma Information (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
2013 Consolidated from January 1 to March 31, 2013	$ 44	$ 307
Consolidated From Jan 1 to Mar 31, 2013 [Member] | NMS [Member]
2013 Consolidated from January 1 to March 31, 2013	26,177
2013 Consolidated from January 1 to March 31, 2013	44
Supplemental Pro Forma From Jan 1 to Mar 31, 2012 [Member] | NMS [Member]
2012 Supplemental pro forma from January 1 to March 31, 2012		21,699
2012 Supplemental pro forma from January 1 to March 31, 2012		379
NMS [Member]
Actual NMS from January 1 to March 31, 2013	767
Actual NMS from January 1 to March 31, 2013	$ 70