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Note 15 - Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Defined Contribution Plan [Table Text Block]
Pension Trust   Pension Plan
Employer
Identification		  
Pension Protection Act (“PPA”) Certified Zone Status
1
   FIP / RP Status Pending /   Contributions   Surcharge   Expiration Date of Collective Bargaining
Fund   Number   2015   2014   Implemented
2
   2015   2014   2013   Imposed   Agreement
3
Pension Trust Fund for Operating Engineers Pension Plan   94-6090764     Red       Red     Yes   $ 2,151     $ 1,757     $ 1,654       No     Various
Laborers Pension Trust for Northern California   94-6277608     Yellow       Yellow     Yes     966       1,447       897       No     Various
Carpenter Funds Administrative Office   94-6050970     Red       Red     Yes     842       1,015       759       No     Various
Cement Mason Pension Trust Fund For Northern California   94-6277669     Yellow       Yellow     Yes     371       322       517       No     Various
All other funds                             10,204       6,267       2,608             Various
Total Contributions:                           $ 14,533     $ 10,808     $ 6,435