Note 7 - Restricted Stock - Non-vested Restricted Stock (Details) shares in Thousands	12 Months Ended
	Mar. 31, 2022 shares
Non-vested restricted stock outstanding at March 31, 2021 (in shares)	160
Restricted stock granted (in shares)	720
Restricted stock vested (in shares)	(99)
Restricted stock forfeited or expired (in shares)	(10)
Non-vested restricted stock outstanding at March 31, 2022 (in shares)	771
Employee Plan [Member]
Non-vested restricted stock outstanding at March 31, 2021 (in shares)	98
Restricted stock granted (in shares)	676
Restricted stock vested (in shares)	(69)
Restricted stock forfeited or expired (in shares)	(3)
Non-vested restricted stock outstanding at March 31, 2022 (in shares)	702
Director Plan [Member]
Non-vested restricted stock outstanding at March 31, 2021 (in shares)	62
Restricted stock granted (in shares)	44
Restricted stock vested (in shares)	(30)
Restricted stock forfeited or expired (in shares)	(7)
Non-vested restricted stock outstanding at March 31, 2022 (in shares)	69