Note 5 - Derivative Instruments and Fair Value Measurements (Details) - Interest Rate Swaps (USD $)	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013
Note 5 - Derivative Instruments and Fair Value Measurements (Details) - Interest Rate Swaps [Line Items]
Notional Amount Outstanding	$ 166,300,000	$ 84,800,000
Interest Rate Swap 1 [Member]
Note 5 - Derivative Instruments and Fair Value Measurements (Details) - Interest Rate Swaps [Line Items]
Notional Amount Outstanding	81,500,000
Fixed Rate	3.895%
Maturity	01/2013
Interest Rate Swap 2 [Member]
Note 5 - Derivative Instruments and Fair Value Measurements (Details) - Interest Rate Swaps [Line Items]
Notional Amount Outstanding	$ 84,800,000	$ 84,800,000
Fixed Rate	3.90%
Maturity	09/2013