Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Contract revenues	$ 2,020,265	$ 2,490,660
Cost of sales	778,542	1,177,032
Gross margin	1,241,723	1,313,628
Expenses:
Engineering	662,250	640,293
General and administrative	463,565	451,678
Total expenses	1,125,815	1,091,971
Income from operations	115,908	221,657
Other income:
Interest income	1,732	460
Net income before income taxes	117,640	222,117
Income tax expense	36,835	68,812
Net income available to common shareholders	$ 80,805	$ 153,305
Income per common share - basic (in dollars per share)
Basic weighted average number of shares outstanding (in shares)	35,568,775	35,564,419
Income per common share - diluted (in dollars per share)
Diluted weighted average number of shares outstanding (in shares)	35,807,830	35,829,565