Note 4 - Goodwill and Intangible Assets (Detail) - Intangible Assets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Gross Carrying Amount	$ 2,598	$ 2,598
Accumulated Amortization	1,029	914
Net Carrying Amount	1,569	1,684
Gross Carrying Amount	3,108	3,108
Net Carrying Amount	2,079	2,194
Trademarks [Member]
Gross Carrying Amount	510	510
Net Carrying Amount	510	510
Customer Relationships [Member]
Gross Carrying Amount	1,480	1,480
Accumulated Amortization	509	439
Net Carrying Amount	971	1,041
Patented Technology [Member]
Gross Carrying Amount	590	590
Accumulated Amortization	254	233
Net Carrying Amount	336	357
Computer Software, Intangible Asset [Member]
Gross Carrying Amount	270	270
Accumulated Amortization	122	115
Net Carrying Amount	148	155
Trade Names [Member]
Gross Carrying Amount	140	140
Accumulated Amortization	42	33
Net Carrying Amount	98	107
Customer Backlog [Member]
Gross Carrying Amount	70	70
Accumulated Amortization	70	70
Noncompete Agreements [Member]
Gross Carrying Amount	48	48
Accumulated Amortization	32	24
Net Carrying Amount	$ 16	$ 24