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Note 11 - Significant Customers/Concentration (Tables)
9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   

For the Three Months Ended

September 30

   

For the Nine Months Ended

September 30

 
   

2013

   

2012

   

2013

   

2012

 

United States and Canada

  $ 736,958     $ 1,164,634     $ 2,264,368     $ 4,629,240  

Australia

    55,093       95,186       223,483       144,100  

South America

    4,679       31,214       30,058       290,191  

Asia

    493,542       328,325       1,645,025       1,148,140  

Europe

    1,659,333       1,496,112       4,991,740       7,198,856  
    $ 2,949,605     $ 3,115,471     $ 9,154,674     $ 13,410,527  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   

For the Three Months Ended

September 30,

   

For the Nine Months Ended

September 30,

 
   

2013

   

2012

   

2013

   

2012

 

Ceramic diesel particulate

  $ 1,386,565     $ 1,909,013     $ 4,858,841     $ 9,765,972  

Liquid filters

    1,440,849       1,042,101       3,679,719       3,328,719  

Kiln furniture

    122,191       164,357       616,114       315,836  
    $ 2,949,605     $ 3,115,471     $ 9,154,674     $ 13,410,527