Note 12 - Segment Information (Details) - Revenue and Assets by Geographic Area (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Revenue	$ 92,590	$ 86,421	$ 75,767
Long-lived assets:
Long-lived assets	74,522	76,231
Total assets:
Total assets	110,996	100,046
United States [Member]
Revenue:
Revenue	85,863	79,895	70,074
Long-lived assets:
Long-lived assets	71,139	72,817
Total assets:
Total assets	97,982	87,670
Canada [Member]
Revenue:
Revenue	6,727	6,526	5,693
Long-lived assets:
Long-lived assets	3,383	3,414
Total assets:
Total assets	$ 13,014	$ 12,376