Note 7 - Net Income (Loss) per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Basic net income (loss) per share computation:
Net loss income	$ 639,453	$ (333,436)	$ (298,030)	$ (3,540,116)	$ (4,322,311)
Add: Deemed dividend related to beneficial conversion feature of Series B Convertible Preferred Stock	(420,000)	0	(420,000)	0
Add: Preferred dividends	(112,807)	(30,667)	(232,807)	(30,667)
Diluted loss income	106,646	(364,103)	(950,837)	(3,570,783)
Net income (loss) attributable to common shareholders	$ 106,646	$ (364,103)	$ (950,837)	$ (3,570,783)
Weighted-average common shares outstanding (in Shares)	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 (in Shares)	153,770	0	0	0
Total adjusted weighted-average shares (in Shares)	3,409,657	3,255,887	3,255,887	3,255,887
Diluted net loss per share (in Dollars per share)	$ 0.03	$ (0.11)	$ (0.29)	$ (1.10)
Basic net loss per share (in Dollars per share)	$ 0.03	$ (0.11)	$ (0.29)	$ (1.10)