Related Party Transactions (Narrative) (Details) - USD ($)	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Related Party Transaction [Line Items]
Payment to related party	$ 0	$ 248,000
Senior Officer of NLEX [Member] \| Lease Amounts [Member] \| Edwardsville, IL [Member]
Related Party Transaction [Line Items]
Related party transaction agreement end date	May 31, 2023
Senior Officer of NLEX [Member] \| Lease Amounts [Member] \| Edwardsville, IL [Member] \| Selling, General and Administrative Expenses [Member]
Related Party Transaction [Line Items]
Payment to related party	$ 55,000	$ 50,000

The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

Name:	us-gaap_RepaymentsOfRelatedPartyDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration