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ACCOUNTS RECEIVABLE (Tables)
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Components of accounts receivable
    2016   2015
 
Accounts Receivable Gross   $ 8,806,000     $ 14,647,000  
Allowance for Doubtful Accounts     (756,000 )     (985,000 )
Accounts Receivable Net   $ 8,050,000     $ 13,662,000  
Allowance for doubtful accounts
    Balance at   Charged to        
    Beginning of   Costs and   Deductions from   Balance at End
    Year   Expenses   Reserves   of Year
Year ended December 31, 2016                                
Allowance for Doubtful Accounts   $ 985,000     $ 274,000     $ 503,000     $ 756,000  
Year ended December 31, 2015                                
Allowance for Doubtful Accounts   $ 1,566,000     $ 177,000     $ 758,000     $ 985,000