REVENUE - Impact of New Revenue Guidance on Financial Statement Line Items (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)
Net Sales	$ 113,370	$ 112,335
Cost of Goods Sold	100,059	100,217
Gross Profit	13,311	12,118
Income (Loss) from Operations	1,249	(1,268)
Income Before Income Taxes	492	(2,071)
Income Tax Expense	326	375
Net Income (Loss)	$ 166	$ (2,446)
Net Income Per Common Share - Diluted	$ 0.06	$ (0.89)
Assets
Inventories	$ 17,004	$ 18,527
Contract Assets	6,431
Shareholders' Equity
Retained Earnings	21,090	19,825	$ 22,315
CONSOLIDATED STATEMENTS OF CASH FLOWS
Net Income	166	(2,446)
Change in Current Operating Items
Inventories	(3,875)
Contract Assets	28
Net Cash Provided by Operating Activities	2,444	$ 806
Pro-forma as of the previous accounting guidance was in effect
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)
Net Sales	108,522
Cost of Goods Sold	95,249
Gross Profit	13,273
Income (Loss) from Operations	1,211
Income Before Income Taxes	454
Income Tax Expense	326
Net Income (Loss)	$ 128
Net Income Per Common Share - Diluted	$ 0.05
Assets
Inventories	$ 22,015
Shareholders' Equity
Retained Earnings	19,671
CONSOLIDATED STATEMENTS OF CASH FLOWS
Net Income	128
Change in Current Operating Items
Inventories	(3,809)
Net Cash Provided by Operating Activities	$ 2,444