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Note 9 - Income Taxes (Details Textual)
6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Effective Income Tax Rate Reconciliation, Percent, Total 4.10% (24.20%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%  
Income Tax Examination, Year under Examination 2019  
Gyros US, Inc [Member]    
Income Tax Examination, Year under Examination 2018