Note 8 - Restricted Stock - Non-vested Restricted Stock (Details) shares in Thousands	12 Months Ended
	Mar. 31, 2019 shares
Non-vested restricted stock outstanding at March 31, 2018 (in shares)	193
Restricted stock granted (in shares)	85
Restricted stock vested (in shares)	(116)
Restricted stock forfeited or expired (in shares)	(12)
Non-vested restricted stock outstanding at March 31, 2019 (in shares)	150
Employee Plan [Member]
Non-vested restricted stock outstanding at March 31, 2018 (in shares)	133
Restricted stock granted (in shares)	47
Restricted stock vested (in shares)	(86)
Restricted stock forfeited or expired (in shares)	(12)
Non-vested restricted stock outstanding at March 31, 2019 (in shares)	82
Director Plan [Member]
Non-vested restricted stock outstanding at March 31, 2018 (in shares)	60
Restricted stock granted (in shares)	38
Restricted stock vested (in shares)	(30)
Restricted stock forfeited or expired (in shares)
Non-vested restricted stock outstanding at March 31, 2019 (in shares)	68