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Schedule II - Valuation and Qualifying Accounts: (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Valuation and Qualifying Accounts [Table Text Block]
   
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
  
   
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
  
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
  
Schedule of Property and Equipment and the Related Depreciation [Table Text Block]
   
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