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

3 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

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

	Three Months Ended			Three Months Ended
	June 30, 2019			June 30, 2018
Basic net income (loss) per share computation:
Net income (loss)	$	257,776		$	(746,073	)
Preferred dividends		(80,000	)		(60,000	)
Net income (loss) attributable to common shareholders		177,776			(806,073	)
Weighted-average common shares outstanding		3,255,887			3,255,887
Basic net income (loss) per share	$	0.05		$	(0.25	)
Diluted net income (loss) per share computation
Net income (loss)	$	257,776		$	(746,073	)
Preferred dividends		(80,000	)		(60,000	)
Diluted income (loss) attributable to common shareholders	$	177,776			(806,073	)
Weighted-average common shares outstanding		3,255,887			3,255,887
Incremental shares attributable to the assumed exercise of       preferred stock, outstanding stock options and warrants		155,531			-
Total adjusted weighted-average shares		3,411,418			3,255,887
Diluted net income (loss) per share	$	0.05		$	(0.25	)

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:

	June 30, 2019		June 30, 2018
Convertible preferred stock		1,130,222		1,050,222
Stock options		118,500		42,500
Warrants		50,000		50,000
		1,298,722		1,142,722