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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2017
Summary of Significant Accounting Policies [Abstract]  
Schedule of financial assets measured at fair value on nonrecurring basis
  As of September 30, 2017 
  Level 1  Level 2  Level 3  Total 
Assets:            
Cash and money market accounts $2,305,264   -   -  $2,305,264 
Liabilities:                
Interest rate swaps  -  $32,005   -  $32,005 

 

  As of December 31, 2016 
  Level 1  Level 2  Level 3  Total 
Assets:            
Cash and money market accounts $5,150,344   -   -  $5,150,344 
Bank certificates of deposit  -  $5,474,013   -  $5,474,013 
Liabilities:                
Interest rate swaps  -  $37,346   -  $37,346 
Schedule of sales to significant customers
  

For the Three-Month Periods Ended 
September 30,

  

For the Nine-Month Periods Ended 
September 30,

 
  2017  2016  2017  2016 
Patterson Companies, Inc.  44%  40%  42%  39%
AmerisourceBergen Corporation  22%  18%  23%  20%
ANIMART LLC (1)  10%  11%  *   * 

 

(1) Assumes that the acquisition of Animal Medic by ANIMART LLC (which closed during the third quarter of 2016) had occurred as of the beginning of the periods being reported.

 

*   Amount is less than 10%.

Schedule of accounts receivable due from significant customers
  

As of

September 30, 2017

  

As of

December 31, 2016

 
Patterson Companies, Inc.  52%  31%
AmerisourceBergen Corporation  20%  33%
Schedule of weighted average and diluted number of shares outstanding
  

For the Three-Month Periods

Ended September 30,

  

For the Nine-Month Periods

Ended September 30,

 
  2017  2016  2017  2016 
Weighted average number of shares outstanding  4,992,803   4,182,529   4,896,782   4,065,243 
Effect of dilutive stock options  -   119,751   102,463   113,938 
Diluted number of shares outstanding  4,992,803   4,302,280   4,999,245   4,179,181 
Outstanding stock options not included in the calculation because the effect would be anti-dilutive  367,000   20,000   63,000   22,000