Note 10 - Quarterly Results for 2012 and 2013 (Details) - Quarterly Results for 2012 and 2013 (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Quarterly Results for 2012 and 2013 [Abstract]
Net sales	$ 45,473,000	$ 44,184,000	$ 30,854,000	$ 30,985,000	$ 31,044,000	$ 30,599,000	$ 29,335,000	$ 28,508,000
Gross profit	15,027,000	15,040,000	11,178,000	11,313,000	10,607,000	10,032,000	9,662,000	9,462,000	52,558,000	39,763,000
Income before taxes on income	2,545,000	2,128,000	2,068,000	1,749,000	825,000	1,692,000	1,567,000	537,000
Net income	$ 1,675,000	$ 1,508,000	$ 1,438,000	$ 1,229,000	$ 485,000	$ 1,242,000	$ 977,000	$ 327,000	$ 5,850,000	$ 3,031,000
Basic
Net income (in Dollars per share)	$ 0.26	$ 0.24	$ 0.23	$ 0.20	$ 0.08	$ 0.20	$ 0.16	$ 0.05	$ 0.93	$ 0.50
Diluted
Net income (in Dollars per share)	$ 0.25	$ 0.24	$ 0.23	$ 0.20	$ 0.08	$ 0.20	$ 0.16	$ 0.05	$ 0.92	$ 0.49
Average Outstanding Shares (Basic) (in Shares)	6,452,587	6,346,260	6,126,323	6,121,180	6,091,377	6,063,269	6,066,244	6,025,874	6,261,588	6,061,691
Average Outstanding Shares (Diluted) (in Shares)	6,630,926	6,403,893	6,170,121	6,169,475	6,140,372	6,148,012	6,140,986	6,142,616	6,343,604	6,142,997