Note 5 - Income (Loss) Per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Basic net income (loss) per share computation:
Net income (loss)	$ 226,586	$ (20,944)	$ 705,118	$ (653,144)
Weighted-average common shares outstanding	3,256,887	3,255,028	3,256,887	3,253,045
Basic net income (loss) per share	$ 0.07	$ (0.01)	$ 0.22	$ (0.20)
Diluted net income (loss) per share computation
Net income (loss)	$ 226,586	$ (20,944)	$ 705,118	$ (653,144)
Add: Change in fair value of warrants	0	0	0	0
Diluted income (loss)	$ 226,586	$ (20,944)	$ 705,118	$ (653,144)
Weighted-average common shares outstanding	3,256,887	3,255,028	3,256,887	3,253,045
Incremental shares attributable to the assumed exercise of outstanding stock options and warrants	4,803	0	5,068	0
Total adjusted weighted-average shares	3,261,690	3,255,028	3,261,955	3,253,045
Diluted net income (loss) per share	$ 0.07	$ (0.01)	$ 0.22	$ (0.20)