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Note 6 - Investments in Joint Ventures
6 Months Ended
Feb. 28, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments and Joint Ventures Disclosure [Text Block]
6.           INVESTMENTS IN JOINT VENTURES

Financial information from the financial statements of the Company’s joint venture in Germany, Excor Korrosionsschutz – Technologien und Produkte GmbH (EXCOR), joint venture in China, Tianjin-Zerust Anticorrosion Co., Ltd. (Tianjin Zerust), for the periods for which it was accounted for under the equity method (See Note 7) and all of the Company’s other joint ventures, are summarized as follows:

   
At February 28, 2015
 
   
Total
   
EXCOR
   
All Other
 
Current assets
  $ 46,802,727     $ 19,669,250     $ 27,133,477  
Total assets
    50,375,058       21,662,648       28,712,410  
Current liabilities
    12,347,251       2,837,566       9,509,685  
Noncurrent liabilities
    1,080,425             1,080,425  
Joint ventures’ equity
    36,947,382       18,825,082       18,122,300  
Northern Technologies International Corporation’s share of joint ventures’ equity
    18,377,038       9,412,543       8,964,499  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings
  $ 16,252,890     $ 9,381,638     $ 6,871,252  

    At August 31, 2014  
   
Total
   
EXCOR
   
Tianjin Zerust
   
All Other
 
Current assets
  $ 61,491,957     $ 24,361,157     $ 9,774,680     $ 27,356,120  
Total assets
    65,466,964       26,652,165       9,793,803       29,020,996  
Current liabilities
    17,542,634       3,512,143       4,438,380       9,592,111  
Noncurrent liabilities
    1,929,488             868,377       1,061,111  
Joint ventures’ equity
    45,994,842       23,140,022       4,487,046       18,367,775  
Northern Technologies International Corporation’s share of joint ventures’ equity
    22,961,989       11,570,013       2,243,524       9,148,452  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings
  $ 20,540,523     $ 11,539,108     $ 2,193,524     $ 6,807,891  

   
Six Months Ended February 28, 2015
 
   
Total
   
EXCOR
   
Tianjin Zerust
   
All Other
 
Net sales
  $ 52,178,238     $ 18,383,653     $ 3,735,457     $ 30,059,128  
Gross profit
    25,540,546       9,766,973       1,783,673       13,989,900  
Net income
    6,152,182       3,924,547       265,648       1,961,987  
Northern Technologies International Corporation’s share of equity in income of joint ventures
  $ 3,081,331     $ 1,962,047     $ 132,824     $ 986,460  

   
Six Months Ended February 28, 2014
 
   
Total
   
EXCOR
   
Tianjin Zerust
   
All Other
 
Net sales
  $ 58,050,376     $ 18,963,579     $ 8,257,630     $ 30,829,167  
Gross profit
    27,600,668       10,072,948       3,834,419       13,693,301  
Net income
    5,479,724       3,763,017       553,963       1,162,744  
Northern Technologies International Corporation’s share of equity in income of joint ventures
  $ 2,823,199     $ 1,881,705     $ 276,948     $ 664,546  

All material profits recorded on sales from the Company to its joint ventures have been eliminated for financial reporting purposes.

On January 2, 2015, the Company announced that, effective as of December 31, 2014, the Company terminated its joint venture agreements with its previous joint venture in China, Tianjin Zerust, and began the process of liquidating the joint venture entity.  The Company intends to conduct future business in China through a newly formed wholly owned subsidiary, NTIC (Shanghai) Co. Ltd. (NTIC China). As of December 31, 2014, the Company started recognizing Tianjin Zerust based on its carrying value instead of the equity method since the Company no longer expects to significantly affect the joint venture’s operations or decision making during its anticipated liquidation.

The Company records expenses that are directly attributable to the joint ventures on its consolidated statements of operations in the line item “Expenses incurred in support of joint ventures.”  The expenses include items such as employee compensation and benefit expenses, travel expense and consulting expense.

The Company did not make any joint venture investments during the six months ended February 28, 2015 and 2014.

On November 30, 2013, the Company agreed to sell its indirect ownership interest in Mütec GmbH (Mütec), the Company’s former joint venture in Germany which manufactures proprietary electronic sensing instruments.  Since the purchase price paid to the Company was less than the book value of the Company’s investment in Mütec, the Company recognized a $50,000 impairment charge during the three months ended November 30, 2013, which is included in the consolidated statements of operations in the line item “Equity income of joint ventures.”  In connection with the transaction, the owner of Mütec borrowed $168,000 from the Company to be repaid over four years with no interest. As of February 28, 2015 and August 31, 2014, $142,277 and $156,854 was due to the Company related to this transaction.