Note 4 - Intangibles (Detail) - Intangible assets (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
December 31, 2011 (Member)
Accumulated Amortization		$ 2,585,000
Net Carrying Value		2,555,000
Weighted Average Amortization Period		13.0
Cost		5,140,000
Accumulated Amortization		2,585,000
Net Carrying Value		2,555,000
Weighted Average Amortization Period		13.0
December 31, 2012 (Member)
Accumulated Amortization	2,998,000
Net Carrying Value	2,142,000
Weighted Average Amortization Period	13.0
Cost	5,140,000
Accumulated Amortization	2,998,000
Net Carrying Value	2,142,000
Weighted Average Amortization Period	13.0
Customer Relationships [Member]
Cost	3,799,000	3,799,000
Accumulated Amortization	1,854,000	1,608,000
Net Carrying Value	1,945,000	2,191,000
Weighted Average Amortization Period	16	16
Accumulated Amortization	1,854,000	1,608,000
Net Carrying Value	1,945,000	2,191,000
Weighted Average Amortization Period	16	16
Trade Know How (Member)
Cost	1,341,000	1,341,000
Accumulated Amortization	1,144,000	977,000
Net Carrying Value	197,000	364,000
Weighted Average Amortization Period	8	8
Accumulated Amortization	1,144,000	977,000
Net Carrying Value	$ 197,000	$ 364,000
Weighted Average Amortization Period	8	8