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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2017
Summary of Significant Accounting Policies [Abstract]  
Schedule of financial assets measured at fair value on nonrecurring basis
  

As of March 31, 2017

 
  Level 1  Level 2  Level 3  Total 
Assets:            
Cash and money market accounts $4,252,020   -   -  $4,252,020 
Bank certificates of deposit  -  $2,978,355   -  $2,978,355 
Liabilities:                
Interest rate swaps  -  $21,611   -  $21,611 

 

  

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
  

Three-Month Period Ended March 31,

 
  2017  2016 
Patterson Companies, Inc.  40%  37%
AmerisourceBergen Corporation  26%  21%
Robert J. Matthews Company  *   10%
Schedule of accounts receivable due from significant customers
 

As of

March 31,
2017

  

As of

December 31,
2016

 
Patterson Companies, Inc.  28%  31%
AmerisourceBergen Corporation  27%  33%
ANIMART LLC(1)  12%  * 

 

(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 weighted average and diluted number of shares outstanding
  

Three-Month Periods
Ended March 31,

 
  2017  2016 
Weighted average number of shares outstanding  4,847,557   3,833,056 
Effect of dilutive stock options  92,736   111,294 
Diluted number of shares outstanding  4,940,293   3,944,350 
Outstanding stock options not included in the calculation because the effect would be anti-dilutive  184,000   14,000