Note 6 - Financial Instruments and Fair Value (Details) (USD $)	3 Months Ended	12 Months Ended		3 Months Ended
	Jun. 30, 2014	Dec. 31, 2011	Jun. 30, 2014 Interest Rate Swap [Member] Cash Flow Hedging [Member]	Jun. 30, 2014 Auction Rate Securities [Member]	Dec. 31, 2013 Auction Rate Securities [Member]
Note 6 - Financial Instruments and Fair Value (Details) [Line Items]
Available-for-sale Securities				$ 6,812,000	$ 6,628,000
Available-for-sale Securities, Amortized Cost Basis				7,425,000	7,575,000
Available-for-sale Securities, Sold at Par				150,000
Derivative, Basis Spread on Variable Rate				2.25%
Asset Impairment Charges		1,000,000
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	184,000
Derivative Asset, Notional Amount			36,800,000
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 700,000