Accounts Receivable (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Accounts Receivable Gross	$ 8,717,000	$ 7,046,000
Allowance for Doubtful Accounts	(859,000)	(524,000)	$ (494,000)
Accounts Receivable Net	$ 7,858,000	$ 6,522,000