Note 14 - Selected Quarterly Financial Data (Unaudited) - Reconciliation of Adjustments to the Previously Reported Consolidated Statements of Operations for Quarterly Information (Details) - USD ($)	3 Months Ended														6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2015	[1]	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013		Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Scenario, Previously Reported [Member]
Net sales			$ 8,842,000		$ 8,684,000	$ 7,442,000		$ 7,259,000		$ 7,438,000		$ 7,299,000	$ 6,909,000		$ 16,126,000	$ 14,208,000	$ 24,968,000	$ 21,646,000		$ 28,905,000	$ 27,581,000
Cost of sales			4,489,000		4,408,000	4,474,000		4,685,000		4,293,000		4,306,000	4,057,000		8,882,000	8,363,000	13,371,000	12,656,000		17,341,000	16,623,000
Gross profit			4,353,000		4,276,000	2,968,000		2,574,000		3,145,000		2,993,000	2,852,000		7,244,000	5,846,000	11,597,000	8,990,000		11,564,000	10,958,000
Income (loss) from operations			783,000		536,000	(1,139,000)		(689,000)		322,000		360,000	172,000		(603,000)	533,000	180,000	854,000		165,000	2,299,000
Net income (loss)			$ 304,000		$ 188,000	$ (413,000)		$ (367,000)		$ 36,000		$ 106,000	$ 30,000		$ (225,000)	$ 136,000	$ 79,000	$ 172,000		$ (195,000)	$ 4,209,000
Net income (loss) per share - diluted (in dollars per share)			$ 0.05		$ 0.03	$ (0.08)		$ (0.06)		$ 0.01		$ 0.02	$ 0.01		$ (0.04)	$ 0.02	$ 0.01	$ 0.03		$ (0.04)	$ 0.74
Restatement Adjustment [Member]
Net sales			$ 849,000		$ (738,000)	$ 182,000		$ (240,000)		$ (37,000)		$ 54,000	$ (504,000)		$ (556,000)	$ (450,000)	$ 293,000	$ (487,000)		$ (727,000)	$ (122,000)
Cost of sales			404,000		(397,000)	91,000		(132,000)		(48,000)		58,000	(230,000)		(306,000)	(172,000)	98,000	(220,000)		(352,000)	(48,000)
Gross profit			445,000		(341,000)	91,000		(108,000)		11,000		(4,000)	(274,000)		(250,000)	(278,000)	195,000	(267,000)		(375,000)	(74,000)
Income (loss) from operations			445,000		(341,000)	91,000		(108,000)		10,000		(4,000)	(274,000)		(250,000)	(278,000)	195,000	(267,000)		(375,000)	(74,000)
Net income (loss)			$ 159,000		$ (124,000)	$ 32,000		$ (153,000)		$ 64,000		$ (1,000)	$ (135,000)		$ (92,000)	$ (136,000)	$ 68,000	$ (72,000)		$ (225,000)	$ (45,000)
Net income (loss) per share - diluted (in dollars per share)			$ 0.03		$ (0.02)	$ 0.01		$ (0.03)		$ 0.01		$ 0	$ (0.03)		$ (0.02)	$ (0.02)	$ 0.02	$ (0.01)		$ (0.04)	$ 0
Net sales	$ 8,547,000		$ 9,691,000	[1]	$ 7,946,000	$ 7,624,000	[1]	$ 7,019,000	[1]	$ 7,401,000	[1]	$ 7,353,000	$ 6,405,000	[1]	$ 15,570,000	$ 13,758,000	$ 25,261,000	$ 21,159,000	$ 33,809,000	$ 28,178,000	$ 27,459,000
Cost of sales			4,893,000		4,011,000	4,565,000		4,553,000		4,245,000		4,364,000	3,827,000		8,576,000	8,191,000	13,469,000	12,436,000	19,343,000	16,989,000	16,575,000
Gross profit	2,674,000		4,798,000	[1]	3,935,000	3,059,000	[1]	2,466,000	[1]	3,156,000	[1]	2,989,000	2,578,000	[1]	6,994,000	5,568,000	11,792,000	8,723,000	14,466,000	11,189,000	10,884,000
Income (loss) from operations			1,228,000		195,000	(1,048,000)		(797,000)		332,000		356,000	(102,000)		(853,000)	255,000	375,000	587,000	322,000	(210,000)	2,225,000
Net income (loss)	$ (170,000)		$ 463,000	[1]	$ 64,000	$ (381,000)	[1]	$ (520,000)	[1]	$ 100,000	[1]	$ 105,000	$ (105,000)	[1]	$ (317,000)	$ 0	$ 147,000	$ 100,000	$ (24,000)	$ (420,000)	$ 4,164,000
Net income (loss) per share - diluted (in dollars per share)	$ (0.03)		$ 0.08	[1]	$ 0.01	$ (0.07)	[1]	$ (0.09)	[1]	$ 0.02	[1]	$ 0.02	$ (0.02)	[1]	$ (0.06)	$ 0	$ 0.03	$ 0.02	$ 0	$ (0.08)	$ 0.74

[1] The first, third and fourth quarters of 2015 include abnormal costs of $17,000, $196,000 and $607,000, respectively. The third and fourth quarters of 2014 include abnormal costs of $44,000 and $353,000, respectively.