Note 12 - Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares				3 Months Ended	12 Months Ended
	Feb. 03, 2017	Nov. 01, 2016	Feb. 03, 2014	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2016
Vested at end of year (Year)				6 years 219 days	6 years 292 days
Outstanding, beginning of period (in shares)				242,350	219,650
Outstanding, beginning of period (in dollars per share)				$ 13.84	$ 13.85
Outstanding, end of period (in dollars per share)				$ 13.84	$ 13.84	$ 13.85
Outstanding, beginning of period (Year)				6 years 292 days	7 years 36 days	7 years 292 days
Vested at end of year (in shares)				131,790	131,790
Vested at end of year (in dollars per share)				$ 13.85	$ 13.85
Granted (in shares)	3,700	19,000	225,150		22,700
Granted (in dollars per share)					$ 13.78
Granted (Year)					10 years
Exercised (in shares)
Exercised (in dollars per share)
Forfeited, exchanged or expired (in shares)
Forfeited, exchanged or expired (in dollars per share)
Outstanding, end of period (in shares)				242,350	242,350	219,650