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Consolidated Statements of Operations - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]    
REVENUES $ 31,162 $ 31,897
Type of Revenue [Extensible List]   us-gaap:ProductMember
Costs and expenses:    
Manufacturing cost of sales 20,233 $ 19,381
Engineering, selling and administrative 9,514 9,077
OPERATING INCOME 1,415 3,439
Other (Expense) Income:    
Interest (expense) income, net (11) 2
Loss on equity investment in unconsolidated subsidiary (262) (16)
Other income, net 162 484
Total other (expense) income, net (111) 470
INCOME BEFORE INCOME TAXES 1,304 3,909
Income tax provision (benefit) 336 (3,107)
NET INCOME $ 968 $ 7,016
Basic per share information:    
Weighted average number of shares used in basic earnings per share calculation 5,173,430 4,883,923
Basic net income per share $ 0.19 $ 1.44
Diluted per share information:    
Weighted average number of shares used in diluted earnings per share calculation 5,216,859 4,977,595
Diluted net income per share $ 0.19 $ 1.41