Note 11 - Common and Preferred Stock (Details Textual) - shares	Mar. 31, 2020	Mar. 31, 2019
Shares Authorized (in shares)	60,000,000
Common Stock, Shares Authorized (in shares)	50,000,000	50,000,000
Preferred Stock, Shares Authorized (in shares)	10,000,000	10,000,000
Preferred Stock, Shares Issued, Total (in shares)	0	0