Note 12 - Segment Information (Detail) - Revenue and Assets by Geographic Area (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue:
Total	$ 86,421	$ 75,767	$ 63,398
Long-lived assets:
Total	76,231	78,539
Total assets:
Total assets	100,046	100,676
United States [Member]
Revenue:
United States	79,895	70,074	58,598
Long-lived assets:
United States	72,817	75,355
Total assets:
Total assets	87,670	90,253
Canada [Member]
Revenue:
Canada	6,526	5,693	4,800
Long-lived assets:
Canada	3,414	3,184
Total assets:
Total assets	$ 12,376	$ 10,423