Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contract revenues	$ 8,561,346	$ 7,196,131
Cost of sales	3,602,555	2,994,087
Gross margin	4,958,791	4,202,044
Expenses:
Engineering	2,712,810	2,180,003
General and administrative	1,752,768	1,565,240
Total expenses	4,465,578	3,745,243
Income from operations	493,213	456,801
Other income:
Interest	2,731	2,834
Net income before income taxes	495,944	459,635
Income tax expense	166,734	223,830
Net income	329,210	235,805
Net income available to common shareholders	$ 329,210	$ 235,805
Income per common share - basic (in dollars per share)	$ 0.01	$ 0.01
Basic weighted average number of shares outstanding (in shares)	35,308,668	35,519,394
Income per common share - diluted (in dollars per share)	$ 0.01	$ 0.01
Diluted weighted average number of shares outstanding (in shares)	35,589,877	35,879,261