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Note 8 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details Textual)			1 Months Ended		3 Months Ended				9 Months Ended
	Jun. 02, 2015 USD ($)	Aug. 01, 2011 USD ($)	Jan. 23, 2014 USD ($)	Dec. 30, 2013 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Oct. 01, 2015 USD ($)	Dec. 31, 2013 USD ($)
Myers and Sons Construction [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners					50.00%				50.00%
Noncontrolling Interest, Ownership Percentage by Parent					50.00%				50.00%
RHB [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners					50.00%				50.00%
Noncontrolling Interest, Ownership Percentage by Parent					50.00%				50.00%
Noncontrolling Interests, Option to Buy Company's 50% Interest Under Certain Conditions, Price									$ 1
JBC [Member] | Years 2011 to 2015 [Member]
Business Acquisition, Earn-Out Calculated, Floor		$ 2,000,000
JBC [Member] | Seven Months Ended 2016 [Member]
Business Acquisition, Earn-Out Calculated, Floor		1,200,000
JBC [Member] | Original Earnout Liability [Member]
Business Acquisition, Undiscounted Earn-Out Liability			$ 5,000,000
JBC [Member] | If Certain EBITDA Thresholds Are Met [Member]
Business Acquisition, Undiscounted Earn-Out Liability			10,000,000
JBC [Member] | For 2014 and 2015 [Member]
Business Acquisition, Earn-Out Calculated, Floor			1,500,000
JBC [Member] | For 2016 and 2017 [Member]
Business Acquisition, Earn-Out Calculated, Floor			2,000,000
JBC [Member]
Business Acquisition, Undiscounted Earn-Out Liability Decrease			$ 600,000								$ 0
Business Acquisition, Additional Price Payments		$ 5,000,000
Business Acquisition, Additional Price Payments Term		5 years
Business Acquisition, Earn-Out Percentage		50.00%
Business Acquisition, Undiscounted Earn-Out Liability					$ 0	$ 0			0			$ 1,400,000
Business Acquisition, Earn-Out Payment								$ 800,000
Business Acquisition, Cost of Acquired Entity Discounted Present Value of Additional Purchase Price										$ 300,000
Revaluation Benefit										300,000
Business Acquisition, Undiscounted Earn-Out Liability Increase					9,300,000				9,300,000
EBITDA Earn-Out Increase Floor									18,500,000
Interest Expense, Other										300,000
Interest Income, Other					0	$ 300,000			300,000
Upon Death [Member] | CEO of RHB [Member]
Obligation to Purchase Member Interest				$ 20,000,000
Obligation to Purchase Percentage Member Interest				50.00%
Cash Surrender Value of Life Insurance				$ 20,000,000
Upon Permanent Disability [Member] | CEO of RHB [Member]
Obligation to Purchase Member Interest				$ 18,000,000
CEO of RHB [Member]
Disability Insurance Policy, Term	5 years
Insurance Policy Disability Benefit Principal Amount	$ 20,000,000
Payments to Noncontrolling Interests					1,000,000		$ 0		3,402,000	1,190,000
Increase (Decrease) in Undistributed Earnings					1,500,000		500,000		800,000	2,000,000
Net Income (Loss) Attributable to Noncontrolling Interest					1,109,000		1,718,000		$ 2,948,000	3,238,000
Number of Agreements with Noncontrolling Interests									2
Interest Expense, Other							0
Interest Income, Other					$ 32,000		$ 113,000		$ 464,000	$ 644,000

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