Line of Credit (Narrative) (Details) - Revolving Credit Facility [Member] - USD ($)		3 Months Ended
	Dec. 21, 2016	Mar. 31, 2020
Line of Credit Facility [Line Items]
Borrowing capacity description		provides for up to a maximum amount of $5 million based on a borrowing base equivalent to 85% of eligible accounts receivable plus the lesser of $2 million or 50% of eligible inventory.
Maximum borrowing capacity	$ 5,000,000
Borrowing base equivalent of eligible accounts receivable, percentage	85.00%
Borrowing base equivalent of eligible inventory	$ 2,000,000
Borrowing base equivalent of eligible inventory, percentage	50.00%
Minimum interest rate	6.50%
Monthly interest payment	$ 2,000
Monthly administrative fee	$ 1,000
Annual facility fee on maximum amount borrowable	1.00%
Automatic renewal term	1 year
Minimum net worth required		$ 13,000,000
Minimum working capital required		4,000,000
Outstanding amount on credit facility		2,200,000
Remaining borrowing capacity		$ 900,000
Prime Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.00%