Note 1 - Organization and Significant Accounting Policies (Detail) - Summary of Intangible Asset Activity (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets Gross Carrying Amount	$ 9,108	$ 8,827
Intangible Assets Accumulated Amortization	(4,270)	(3,385)
Intangible Assets Net Carrying Amount	4,838	5,442
Minimum [Member] | Customer Lists [Member]
Intangible Assets Gross Amortization Period	3 years
Minimum [Member] | Patents [Member]
Intangible Assets Gross Amortization Period	12 years
Minimum [Member] | Noncompete Agreements [Member]
Intangible Assets Gross Amortization Period	5 years
Minimum [Member] | Unpatented Technology [Member]
Intangible Assets Gross Amortization Period	7 years
Maximum [Member] | Customer Lists [Member]
Intangible Assets Gross Amortization Period	15 years
Maximum [Member] | Patents [Member]
Intangible Assets Gross Amortization Period	18 years
Maximum [Member] | Noncompete Agreements [Member]
Intangible Assets Gross Amortization Period	6 years
Maximum [Member] | Unpatented Technology [Member]
Intangible Assets Gross Amortization Period	8 years
Customer Lists [Member]
Intangible Assets Gross Carrying Amount	4,567	4,567
Intangible Assets Accumulated Amortization	(2,186)	(1,779)
Intangible Assets Net Carrying Amount	2,381	2,788
Trade Names [Member]
Intangible Assets Gross Amortization Period	8 years
Intangible Assets Gross Carrying Amount	351	351
Intangible Assets Accumulated Amortization	(175)	(132)
Intangible Assets Net Carrying Amount	176	219
Patents [Member]
Intangible Assets Gross Carrying Amount	2,083	1,802
Intangible Assets Accumulated Amortization	(667)	(530)
Intangible Assets Net Carrying Amount	1,416	1,272
Noncompete Agreements [Member]
Intangible Assets Gross Carrying Amount	376	376
Intangible Assets Accumulated Amortization	(313)	(237)
Intangible Assets Net Carrying Amount	63	139
Unpatented Technology [Member]
Intangible Assets Gross Carrying Amount	1,731	1,731
Intangible Assets Accumulated Amortization	(929)	(707)
Intangible Assets Net Carrying Amount	$ 802	$ 1,024