Note 16 - Summary of Unaudited Quarterly Financial Data (Details) - Quarterly Financial Data of the Company (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Quarterly Financial Data of the Company [Abstract]
Net sales (in Dollars)	$ 72,482	$ 72,521	$ 71,320	$ 71,526	$ 69,369	$ 72,824	$ 72,393	$ 70,177	$ 287,849	$ 284,763	$ 272,734
Gross profit (in Dollars)	14,465	13,896	13,271	13,384	12,759	13,558	12,366	12,214	55,016	50,897	44,125
Income after income taxes
Continuing operations (in Dollars)	507	305	205	90	(624)	(56,536)	(507)	(387)	2,269	(79,805)	(1,634)
Discontinued operations (in Dollars)	397	1,606	893	189	1,343	1,033	572	250
Net income (in Dollars)	$ 904	$ 1,911	$ 1,098	$ 279	$ 719	$ (55,503)	$ 65	$ (137)	$ 4,192	$ (54,856)	$ 181
Basic earnings per common share:
Net income from continuing operations	$ 0.03	$ 0.02	$ 0.02	$ 0.01	$ (0.04)	$ (3.45)	$ (0.03)	$ (0.03)
Net income from discontinued operations	$ 0.03	$ 0.10	$ 0.05	$ 0.01	$ 0.08	$ 0.06	$ 0.03	$ 0.02	$ 0.19	$ 0.19	$ 0.10
Total	$ 0.06	$ 0.12	$ 0.07	$ 0.02	$ 0.04	$ (3.39)		$ (0.01)	$ 0.26	$ (3.35)	$ 0.01
Diluted earnings per common share:
Net income from continuing operations	$ 0.03	$ 0.02	$ 0.02	$ 0.01	$ (0.04)	$ (3.45)	$ (0.03)	$ (0.03)
Net income from discontinued operations	$ 0.02	$ 0.10	$ 0.05	$ 0.01	$ 0.08	$ 0.06	$ 0.03	$ 0.02	$ 0.18	$ 0.19	$ 0.10
Total	$ 0.05	$ 0.12	$ 0.07	$ 0.02	$ 0.04	$ (3.39)		$ (0.01)	$ 0.25	$ (3.35)	$ 0.01