Note 5 - Net Income per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($)	3 Months Ended
	Jun. 30, 2016	Jun. 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