Note 5 - Net Income per Share (Tables)

3 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

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

	Three Months Ended		Three Months Ended
	June 30, 2016		June 30, 2015
Basic net income per share computation:
Net income	$	410,309	$	279,066
Weighted-average common shares outstanding		3,255,887		3,256,887
Basic net  income per share	$	0.13	$	0.09
Diluted net income per share computation
Net income	$	410,309	$	279,066
Add: Change in fair value of warrants		92,100		198,000
Diluted income	$	318,209		81,066
Weighted-average common shares outstanding		3,255,887		3,256,887
Incremental shares attributable to the assumed exercise of outstanding stock options and warrants		18,942		63,555
Total adjusted weighted-average shares		3,274,829		3,320,442
Diluted net  income per share	$	0.10	$	0.02

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, 2016		June 30, 2015
Stock options		65,000		99,500
Warrants		186,920		147,336
		251,920		246,836