Shareholders' Equity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Stock-based compensation expense	$ 172,000	$ 422,000
Cost of Sales
Stock-based compensation expense	5,000	14,000
Selling Expenses
Stock-based compensation expense	38,000	121,000
Marketing Expenses
Stock-based compensation expense	(1,000)	12,000
General and Administrative Expense
Stock-based compensation expense	$ 130,000	$ 275,000