Note 2 - Investments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Certificates of Deposit [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Certificates of Deposit [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2013 Certificates of Deposit [Member]
Note 2 - Investments (Details) [Line Items]
Assets, Fair Value Disclosure					$ 2,000,000	$ 2,800,000	$ 2,000,000
Available-for-sale Securities, Gross Realized Gain (Loss)	0		0
Available-for-sale Securities, Gross Unrealized Gain (Loss)	0		0
Available-for-sale Securities, Gross Realized Gains		0		3,000
Available-for-sale Securities, Gross Realized Losses		0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities				11,000
Available-for-sale Securities, Gross Unrealized Gain				41,000
Available-for-sale Securities, Gross Unrealized Loss				0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 0	$ 0	$ 0	$ 0