Note 2 - Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Property, Plant and Equipment, Estimated Useful Lives [Table Text Block]

Building & building equipment (years)

     20 - 39  

Machinery and equipment (years)

     3 – 33  

Transportation equipment (years)

     5 – 33  

Other (years)

     5 – 33