NET INCOME PER SHARE COMPUTATIONS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
NET INCOME PER SHARE COMPUTATIONS
Net income (numerator) amounts used for basic and diluted per share computations:	$ 553,460	$ 1,150,485	$ 957,757	$ 56,572	$ 2,370,558	$ 1,632,845	$ 725,351	$ 989,690	$ 2,718,274	$ 5,718,444
Weighted average shares (denominator) of common stock outstanding:
Basic									4,594,118	4,481,667
Plus dilutive effect of stock options									13,691	53,269
Diluted									4,607,809	4,534,936
Net income per common share:
Basic	$ 0.12	$ 0.25	$ 0.21	$ 0.01	$ 0.52	$ 0.36	$ 0.16	$ 0.22	$ 0.59	$ 1.28
Diluted	$ 0.12	$ 0.25	$ 0.21	$ 0.01	$ 0.52	$ 0.36	$ 0.16	$ 0.22	$ 0.59	$ 1.26