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Schedule II - Valuation and Qualifying Accounts:
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II – Valuation and Qualifying Accounts:
 
The following is a summary of the allowance for doubtful accounts related to accounts receivable for the years ended
December 31:
 
   
2018
    
2017
  
Balance at beginning of year
   $
114,000
     $
137,000
  
Charged to expenses
    
4,000
      
6,000
  
Uncollectible accounts written off
    
(33,000
 )    
(29,000
 )
Balance at end of year
   $
85,000
     $
114,000
  
 
The following is a summary of the allowance for excess inventory for the years ended
December 31:
 
   
2018
    
2017
  
Balance at beginning of year
   $
500,000
     $
794,000
  
Charged to expenses
    
-
      
-
  
Excess inventory written off
    
(46,000
 )    
(294,000
 )
Balance at end of year
   $
454,000
     $
500,000
  
 
The following is a summary of property and equipment and the related accounts of accumulated depreciation for the years ended
December 31:
 
   
2018
    
2017
  
Cost Basis
  
 
 
 
  
 
 
 
Balance at beginning of year
   $
31,443,000
     $
38,250,000
  
Additions
    
492,000
      
813,697
  
Disposals
    
 
      
(7,620,697
 )
Balance at end of year
   $
31,935,000
     $
31,443,000
  
                 
Accumulated depreciation
  
 
 
 
  
 
 
 
Balance at beginning of year
   $
26,879,000
     $
32,938,000
  
Depreciation
    
1,241,000
      
1,568,697
  
Disposals
    
 
      
(7,620,697
 )
Balance at end of year
   $
28,120,000
     $
26,886,000
  
 
 
 
 
 
The following is a summary of the valuation allowance for income taxes for the years ended
December 31:
 
Deferred Tax Asset Valuation Allowance
  
2018
    
2017
  
Beginning Balance
    
631,706
      
45,000
  
Additions charged (credited) to expense
    
1,777,768
      
586,706
  
Balance at end of year
    
2,409,474
      
631,706