Note 7 - Stockholders' Equity (Detail) (USD $)	0 Months Ended				1 Months Ended			12 Months Ended					0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended						12 Months Ended
	Oct. 12, 2010	Aug. 04, 2010	Jul. 16, 2010	May 07, 2010	Aug. 23, 2010	Jan. 31, 2010	Dec. 31, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Stock Options [Member]	Aug. 04, 2011 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Aug. 12, 2011 Issuance Of Common Stock For Acquisitions [Member]	Dec. 31, 2009 Contingent Consideration [Member]	Dec. 31, 2010 Series A Preferred Stock [Member]	May 07, 2010 Placement Agent [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 31, 2012 Warrant [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2012 2010 Acquisition Agreement [Member]	Mar. 31, 2010 Minimum [Member]	Mar. 31, 2010 Maximum [Member]	Dec. 31, 2011 Acquisitions Completed Through June 30, 2011 [Member]
Stock Issued During Period, Shares, Acquisitions											1,767,994						355,584			2,100,000
Stock Issued During Period, Value, Acquisitions (in Dollars)									$ 45,386,000	$ 10,076,000	$ 2,900,000						$ 572,000									$ 45,400,000
Stock Issued During Period, Shares, New Issues		103,947			17,000	739,506				9,300,000	1,250,361							4,975,180	407,062
Stock Issued During Period, Value, New Issues (in Dollars)		576,000			200,000	1,400,000	560,000			2,966,000	3,500,000								1,000,000
Range Of Proceeds From Private Placement (in Dollars)																								5,000,000	33,000,000
Proceeds from Issuance or Sale of Equity (in Dollars)										136,660,000								33,000,000
Class Of Warrants Or Rights Exercisable Term										5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)										6.63
Placement Agent Fee										7.00%
Expense Allowance										2.00%
Private Placement Cash Consideration (in Dollars)										270,000
Warrants Issued				447,763
Value Of Warrants Issued (in Dollars)				126,000
Warrants Exercised During Period										4,388
Class of Warrant or Right, Outstanding										443,375
Stock Issued During Period, Shares, Restricted Stock Award, Gross	6,853		43,620					39,000						75,000
Stock Issued During Period, Value, Restricted Stock Award, Gross (in Dollars)	44,000		145,000					455,000
Stock Issued During Period, Shares, Treasury Stock Reissued								6,000												203,000
Stock Issued During Period, Value, Treasury Stock Reissued (in Dollars)								85,000	1,788,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period								282,000				458,000			14,000
Stock Issued During Period, Shares, Other									21,000							58,000
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued													31,000
Stock Issued During Period, Value, Other (in Dollars)													425,000			808,000
Stock Repurchase Program, Authorized Amount (in Dollars)									20,000,000
Stock Repurchased During Period, Shares								39,000	1,009,000														67,000
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)								$ 9.91	$ 9.34
Treasury Stock, Value, Acquired, Cost Method (in Dollars)								387,000	9,421,000
Stock Issued During Period, Shares, Conversion of Convertible Securities																					21,000	9,000
Stock Repurchased During Period, Value (in Dollars)								$ 387,000															$ 896,000