Note 6 - Net Income (Loss) per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic net (loss) income per share computation:
Net (loss) income	$ (2,920,589)	$ 272,055	$ (3,206,680)	$ 682,364
Weighted-average common shares outstanding	3,255,887	3,255,887	3,255,887	3,255,887
Basic net (loss) income per share	$ (0.90)	$ 0.08	$ (0.98)	$ 0.21
Diluted net (loss) income per share computation
Net (loss) income	$ (2,920,589)	$ 272,055	$ (3,206,680)	$ 682,364
Add: Change in fair value of warrants	0	34,000	0	33,000
Diluted (loss) income	$ (2,920,589)	$ 238,055	$ (3,206,680)	$ 649,364
Weighted-average common shares outstanding	3,255,887	3,255,887	3,255,887	3,255,887
Incremental shares attributable to the assumed exercise of outstanding stock options and warrants	0	10,246	0	11,305
Total adjusted weighted-average shares	3,255,887	3,266,133	3,255,887	3,267,192
Diluted net (loss) income per share	$ (0.90)	$ 0.07	$ (0.98)	$ 0.20