Note 12 - Business Segment, Geographic and Quarterly Financial Data (Detail) - Summary of Quarterly Financial Data (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income (loss)	$ 2,776	$ 6,148	$ 1,753
Basic earnings per share (in Dollars per share)	$ 0.12	$ 0.26	$ 0.07
Diluted earnings per share (in Dollars per share)	$ 0.12	$ 0.25	$ 0.07
First Quarter [Member]
Revenues	25,212	22,622
Cost of sales	13,220	11,466
Net income (loss)	1,543	1,339
Basic earnings per share (in Dollars per share)	$ 0.07	$ 0.06
Diluted earnings per share (in Dollars per share)	$ 0.06	$ 0.05
SecondQuarterMember
Revenues	20,911	19,021
Cost of sales	11,880	10,553
Net income (loss)	68	430
Basic earnings per share (in Dollars per share)	$ 0.00	$ 0.02
Diluted earnings per share (in Dollars per share)	$ 0.00	$ 0.02
Third Quarter [Member]
Revenues	24,907	24,023
Cost of sales	14,671	13,050
Net income (loss)	1,194	2,655
Basic earnings per share (in Dollars per share)	$ 0.05	$ 0.11
Diluted earnings per share (in Dollars per share)	$ 0.05	$ 0.11
Fourth Quarter [Member]
Revenues	26,614	28,002
Cost of sales	17,128	14,788
Net income (loss)	$ (29)	$ 1,724
Basic earnings per share (in Dollars per share)	$ 0.00	$ 0.07
Diluted earnings per share (in Dollars per share)	$ 0.00	$ 0.07