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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Activities in allowance for doubtful accounts
Year  Balance at
Beginning of
Year		  Charged to
Costs and
Expenses		  Amounts
Written Off		  Balance at
End of
Year
 2015   $89,058   $—     $—     $89,058 
 2014   $89,058   $—     $—     $89,058 
Inventory components
   December 31,
   2015  2014
Raw materials and sub-assemblies   $2,521,585   $2,153,764 
Finished goods    39,083    61,175 
Inventory reserves    (1,234,578)   (1,257,612)
Inventory, net  $1,326,090  $957,327
Major customers as a percentage of net accounts receivable balances
   December 31,
   2015  2014
Ingram Micro Inc.      35%   42%
Bluestar, Inc.      22%   25%
ScanSource, Inc.      17%   14%
Reserves for product warranty costs
Year  Balance at
Beginning of Year		  Additional Warranty Reserves  Amounts
Charged to Reserves		  Balance at
End of
Year
 2015   $78,871   $41,029   $(41,029)  $78,871 
 2014   $69,554   $44,817   $(35,500)  $78,871 
Net income per share
   Years Ended December 31,
   2015  2014
Numerator:          
   Net income   $1,817,672   $432,117 
Denominator:          
Weighted average shares outstanding used in computing net income per share:          
         Basic    5,554,541    5,005,579 
Effect of dilutive stock options and warrants (treasury stock method)    421,511    245,335 
         Diluted    5,975,052    5,250,914 
Net income per share applicable to common stockholders:          
         Basic   $0.33   $0.09 
         Diluted   $0.30   $0.08 
Revenue by geographic areas
   Years Ended December 31,
Revenues: (in thousands)  2015  2014
   United States   $14,343   $12,840 
   Europe    2,698    2,864 
   Asia and rest of world    1,359    1,317 
   $18,400  $17,021
Major customers accounted for at least 10% of total revenues
   Years Ended December 31,
   2015  2014
Ingram Micro Inc.    29%   31%
BlueStar, Inc.    22%   17%
Scansource, Inc.    18%   19%