Note 7 - Net Income (Loss) per Share (Tables)

6 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended			Three Months Ended
	September 30, 2019			September 30, 2018
Basic net income (loss) per share computation:
Net income (loss)	$	536,234		$	(191,410	)
Preferred dividends		(80,000	)		(60,000	)
Net income (loss) attributable to common shareholders		456,234			(251,410	)
Weighted-average common shares outstanding		3,255,887			3,255,887
Basic net income (loss) per share	$	0.14		$	(0.08	)
Diluted net income (loss) per share computation
Net income (loss) attributable to common shareholders	$	456,234		$	(251,410	)
Add: Preferred dividends		80,000			-
Diluted income (loss) attributable to common shareholders	$	536,234		$	(251,410	)
Weighted-average common shares outstanding		3,255,887			3,255,887
Incremental shares attributable to the assumed conversion of       preferred stock, and exercise of outstanding stock options and      warrants		1,689,778			-
Total adjusted weighted-average shares		4,945,665			3,255,887
Diluted net income (loss) per share	$	0.11		$	(0.08	)

	Six Months Ended			Six Months Ended
	September 30, 2019			September 30, 2018
Basic net income (loss) per share computation:
Net income (loss)	$	794,010		$	(937,483	)
Preferred dividends		(160,000	)		(120,000	)
Net income (loss) attributable to common shareholders		634,010			(1,057,483	)
Weighted-average common shares outstanding		3,255,887			3,255,887
Basic net income (loss) per share	$	0.19		$	(0.32	)
Diluted net income (loss) per share computation
Net income (loss) attributable to common shareholders	$	634,010		$	(1,057,483	)
Add: Preferred dividends		160,000			-
Diluted income (loss) attributable to common shareholders	$	794,010		$	(1,057,483	)
Weighted-average common shares outstanding		3,255,887			3,255,887
Incremental shares attributable to the assumed conversion of       preferred stock, and exercise of outstanding stock options and      warrants		1,689,778			-
Total adjusted weighted-average shares		4,945,665			3,255,887
Diluted net income (loss) per share	$	0.16		$	(0.32	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table summarizes securities that, if exercised, would have an anti-dilutive effect on earnings per share:

	September 30, 2019		September 30, 2018
Convertible preferred stock		-		1,070,222
Stock options		118,500		42,500
Warrants		50,000		50,000
		168,500		1,162,722