Note 9 - Stock Based Compensation (Details Textual) - Stock Option Plan [Member] - shares		3 Months Ended
	Aug. 27, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum Per Person	2.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		0	791,617
Consultant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum Per Person	2.00%
Related Party [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum Per Person	2.00%