Note 10 - Quarterly Results for 2011 and 2012 (Detail) - Quarterly Results for 2011 and 2012 (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 31,044,000	$ 30,599,000	$ 29,335,000	$ 28,508,000	$ 27,238,000	$ 30,731,000	$ 27,505,000	$ 26,899,000
Gross profit	10,607,000	10,032,000	9,662,000	9,462,000	9,284,000	11,196,000	9,928,000	9,851,000	39,763,000	40,259,000
Income before taxes on income	825,000	1,692,000	1,567,000	537,000	615,000	2,600,000	1,432,000	939,000
Net income	$ 485,000	$ 1,242,000	$ 977,000	$ 327,000	$ 725,000	$ 1,880,000	$ 932,000	$ 599,000	$ 3,031,000	$ 4,136,000
Basic
Net income (in Dollars per share)	$ 0.08	$ 0.20	$ 0.16	$ 0.05	$ 0.12	$ 0.31	$ 0.16	$ 0.10	$ 0.50	$ 0.69
Diluted
Net income (in Dollars per share)	$ 0.08	$ 0.20	$ 0.16	$ 0.05	$ 0.12	$ 0.31	$ 0.15	$ 0.10	$ 0.49	$ 0.68
Average Outstanding Shares (Basic) (in Shares)	6,091,377	6,063,269	6,066,244	6,025,874	5,987,598	5,986,676	5,995,147	5,978,828	6,061,691	5,987,062
Average Outstanding Shares (Diluted) (in Shares)	6,140,372	6,148,012	6,140,986	6,142,616	6,137,137	6,079,430	6,092,118	6,070,970	6,142,997	6,094,914