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Note 10 - Acquisitions (Details) (USD $)
9 Months Ended 1 Months Ended 0 Months Ended 0 Months Ended
Sep. 30, 2014
May 31, 2014
Selling, General and Administrative Expenses [Member]
CNG Fuel Systems [Member]
Jun. 25, 2014
CCTTS [Member]
Jun. 25, 2014
CCTTS [Member]
Jul. 01, 2014
Truck Parts Depot, Inc. [Member]
Jan. 13, 2014
CIT, Inc [Member]
Jan. 13, 2014
CIT, Inc [Member]
Note 10 - Acquisitions (Details) [Line Items]              
Business Combination, Consideration Transferred         $ 500,000 $ 145,100,000  
Equity Method Investment, Ownership Percentage       50.00%      
Payments to Acquire Equity Method Investments     2,200,000        
Research and Development Expense 2,000,000 2,000,000          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)           83,091  
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned             $ 2,000,000