Note 15 - Acquisition of Business (Details) - Pro Forma Results of Operations (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]
Net sales									$ 196,249,000	$ 151,496,000
Income before taxes on income									17,529,000	8,490,000
Net income	2,856,000	3,368,000	3,907,000	1,218,000	1,675,000	1,508,000	1,438,000	1,229,000	11,349,000	5,850,000
(Basic) (in Shares)	13,481,494	13,375,566	13,207,804	13,128,946	12,905,174	12,692,520	12,252,646	12,242,360	13,298,452	12,523,176
(Diluted) (in Shares)	14,252,310	14,004,202	13,648,540	13,553,740	13,261,852	12,807,786	12,340,242	12,338,950	13,864,698	12,687,208
Basic
Net income (in Dollars per share)	$ 0.21	$ 0.25	$ 0.30	$ 0.09	$ 0.13	$ 0.12	$ 0.12	$ 0.10	$ 0.85	$ 0.47
Diluted
Net income (in Dollars per share)	$ 0.20	$ 0.24	$ 0.29	$ 0.09	$ 0.13	$ 0.12	$ 0.12	$ 0.10	$ 0.82	$ 0.46
Pro Forma [Member]
Condensed Income Statements, Captions [Line Items]
Net sales										168,838,000
Income before taxes on income										9,590,000
Net income										$ 6,565,000
(Basic) (in Shares)										12,731,794
(Diluted) (in Shares)										12,895,826
Basic
Net income (in Dollars per share)										$ 0.52
Diluted
Net income (in Dollars per share)										$ 0.51