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Note 1 - Summary of Business and Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Property Plant and Equipment, Useful Lives [Table Text Block]
  Buildings (in years)
 
39
 
  Construction equipment (in years)
5
-
15
  Land improvements (in years)
5
-
15
  Office furniture and fixtures (in years)
3
-
10
  Leasehold improvements (in years or lease period, if shorter)
3
-
10
  Transportation equipment (in years)
 
5