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Intangible Assets
 12 Months Ended
Mar. 31, 2016
Intangible Assets [Abstract]  
Intangible Assets
4. Intangible Assets

The following is a summary of acquired intangible assets subject to amortization at March 31:

    2016  2015 
  
Weighted
Average
Amortization
 Period 
  
Gross Carrying
Value
   
Accumulated
Amortization
   
Gross Carrying
Value
   
Accumulated
Amortization
 
Intangible assets subject to amortization
                  
Trademarks
 
11 years
 
$
705,000
  
$
127,000
  
$
397,000
  
$
278,000
 
Customer relationships
 
13 years
  
5,900,000
   
1,905,000
   
6,211,000
   
3,756,000
 
Total
   
$
6,605,000
  
$
2,032,000
  
$
6,608,000
  
$
4,034,000
 

During the years ended March 31, 2016 and 2015, the Company retired $2,623,000 and $666,000, respectively, of fully amortized intangible assets.

Amortization expense for acquired intangible assets is as follows:

  
Years Ended March 31,
 
  
2016
  
2015
  
2014
 
          
Amortization expense
 
$
621,000
  
$
670,000
  
$
739,000
 

The estimated future amortization expense for acquired intangible assets subject to amortization is as follows:

Year Ending March 31,
   
2017
 
$
580,000
 
2018
  
580,000
 
2019
  
580,000
 
2020
  
580,000
 
2021
  
580,000
 
Thereafter
  
1,673,000
 
Total
 
$
4,573,000