Note 8 - Loss Per Share - Net Loss and Common Shares Used in Per Share Computations (Details) - shares shares in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 24, 2017
Equity Option [Member]
Anti-dilutive securities excluded from computation of earning per share (in shares)	1,498	1,104
Restricted Stock [Member]
Anti-dilutive securities excluded from computation of earning per share (in shares)	262	350
Common Shares Issuable for Debt Interest [Member]
Anti-dilutive securities excluded from computation of earning per share (in shares)	25	60
Convertible Debt Securities [Member]
Anti-dilutive securities excluded from computation of earning per share (in shares)	7,113	1,853
Warrant [Member]
Anti-dilutive securities excluded from computation of earning per share (in shares)	3,960	3,737