Note 5 - Supplemental Cash Flow Information (Detail) (USD $)	6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 06, 2012	Jun. 30, 2012 Exercise of Stock Options [Member]	Jun. 30, 2011 Exercise of Stock Options [Member]	Jun. 30, 2012 Exercise of Stock Options [Member]	Jun. 30, 2011 Exercise of Stock Options [Member]
Income Taxes Paid (in Dollars)	$ 896,000	$ 345,000
Interest Paid (in Dollars)	$ 18,000	$ 12,000
Shares, Issued			44,912
Stock Repurchased During Period, Shares				8,403	8,491	8,403	8,491
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	51,602			8,896	10,900	8,896	10,900