Note 5 - Credit Facility (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)	$ 5.0
Debt Instrument, Basis Spread on Variable Rate			1.00%	1.50%
Line of Credit Facility, Amount Outstanding (in Dollars)	$ 3.5	$ 3.5
Line of Credit Facility, Interest Rate at Period End	1.20%	1.80%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.25%	0.75%