Accounts Receivable (Details 1) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts
Balance at Beginning of Year	$ 524,000	$ 494,000
Charged to Costs and Expenses	556,000	30,000
Deductions from Reserves	221,000
Balance at End of Year	$ 859,000	$ 524,000