Note 7 - Net Income (Loss) per Share (Details) - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share - shares	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	1,298,722	1,142,722
Convertible Preferrred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	1,130,222	1,050,222
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	118,500	42,500
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	50,000	50,000