Note 5 - Income (Loss) Per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic net income (loss) per share computation:
Net income (loss)	$ 199,466	$ (248,195)	$ 478,532	$ (632,200)
Weighted-average common shares outstanding	3,256,887	3,252,702	3,256,887	3,252,048
Basic net income (loss) per share	$ 0.06	$ (0.08)	$ 0.15	$ (0.19)
Diluted net income (loss) per share computation
Net income (loss)	$ 199,466	$ (248,195)	$ 478,532	$ (632,200)
Add: Change in fair value of warrants	0	0	0	0
Diluted income (loss)	$ 199,466	$ (248,195)	$ 478,532	$ (632,200)
Weighted-average common shares outstanding	3,256,887	3,252,702	3,256,887	3,252,048
Incremental shares attributable to the assumed exercise of outstanding stock options and warrants	3,912	0	5,171	0
Total adjusted weighted-average shares	3,260,799	3,252,702	3,262,058	3,252,048
Diluted net income (loss) per share	$ 0.06	$ (0.08)	$ 0.15	$ (0.19)