STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]
BALANCE at Dec. 31, 2015	$ 2,641,429	$ 4,534	$ 1,806,526	$ 953,911	$ (123,542)
BALANCE (in shares) at Dec. 31, 2015		4,533,265
Common stock awarded to board member from treasury	16,500	$ 15	2,985	0	13,500
Common stock awarded to board member from treasury (in shares)		15,000
Shares repurchased into treasury	(36,355)	$ (37)	0	0	(36,318)
Shares repurchased into treasury (in shares)		(36,300)
Net income	142,851	$ 0	0	142,851	0
BALANCE at Dec. 31, 2016	2,764,425	$ 4,512	1,809,511	1,096,762	(146,360)
BALANCE (in shares) at Dec. 31, 2016		4,511,965
Net income	583,051	$ 0	0	583,051	0
BALANCE at Dec. 31, 2017	$ 3,347,476	$ 4,512	$ 1,809,511	$ 1,679,813	$ (146,360)
BALANCE (in shares) at Dec. 31, 2017		4,511,965