Consolidated Balance Sheets (Parentheticals) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounts receivable, allowance for doubtful accounts (in Dollars)	$ 7,500	$ 7,500
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value (in Dollars per share)	$ 0.10	$ 0.10
Common stock, par value (in Dollars per share)	$ 0.10	$ 0.10
Common stock, shares issued	3,255,887	3,255,887
Common stock, shares outstanding	3,255,887	3,255,887
Common stock, shares authorized	7,000,000	7,000,000
Series A Preferred Stock [Member]
Preferred stock, par value (in Dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares issued	500,000	500,000
Preferred stock, shares outstanding	500,000	500,000
Preferred stock, Cumulative Series Convertible Preferred	8.00%	8.00%
Series B Preferred Stock [Member]
Preferred stock, par value (in Dollars per share)	$ 0.10
Preferred stock, shares issued	166,667
Preferred stock, shares outstanding	166,667
Preferred stock, Cumulative Series Convertible Preferred	8.00%