Schedule of Reconciliation of Basic and Diluted Net Income (loss) Per Share (Details) - USD ($)	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income (loss) per common share:
Net income (loss)	$ 395,006	$ (299,670)
Shares outstanding: Weighted avg. common shares outstanding - basic	2,076,756	2,040,166
Shares outstanding: Effect of the assumed exercise of dilutive stock options	$ 43,199
Shares outstanding: Weighted avg. common shares outstanding - dilutive	2,119,955	2,040,166
Income (loss) per common share: Basic	$ 0.19	$ (0.15)
Income (loss) per common share: Diluted	$ 0.19	$ (0.15)