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Note 4 - Computation of Net Loss per Common Share (Details Textual) - shares
shares in Millions
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0.1 1.0
Restricted Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   0.2
Share-based Payment Arrangement, Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   0.8