Notes Payable (Tables)

12 Months Ended

Dec. 31, 2018

Notes Payable [Abstract]

Schedule of notes payable

	December 31,
	2018		2017
Note payable to a Bank, maturing September 2021; with monthly payments of approximately $26 of principal and interest fixed at 3.99%; collateralized by principally all assets of the Company.	$	799	$	1,071
Note payable to a Bank, maturing July 2031; with monthly payments of approximately $11 of principal and interest fixed at 5.29%; collateralized by principally all assets of Smith-Columbia Corporation and guaranteed by Smith-Midland Corporation.		1,169		1,234
Note payable to a Bank, maturing April 2021; with monthly payments of approximately $6.2 of principal and interest at prime at variable rate (5.29% at December 31, 2018 and 2017); collateralized by certain property of the Company.		163		227
Construction loan draw on-line-of-credit for the North Carolina Expansion, which is part of the $4,000 line-of-credit listed below		1,000		—
Installment notes, collateralized by certain machinery and equipment maturing at various dates, primarily through 2021; with monthly payments varying from $0.3 to $4.1 with weighted average interest at 4.7% and 4.2% at December 31, 2018 and 2017, respectively.		1,372		1,001
A revolving line-of-credit evidenced by a note payable to a Bank, with the maximum amount of $4,000, maturing October 1, 2019, with interest only payments and an initial rate of 5.00% adjustable monthly (5.50% at December 31, 2018). The line-of-credit is collateralized by a first lien position on the Company's accounts receivable and inventory and a second lien position on all other business assets.		—		—
		4,503		3,533
Less current maturities		1,711		637
	$	2,792	$	2,896

Schedule of maturities of notes payable

Year Ending December 31,
2019	$	1,711
2020		737
2021		577
2022		271
2023		216
Thereafter		991
	$	4,503