Note 5 - Fair Values of Financial Instruments (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Note 5 - Fair Values of Financial Instruments (Details) [Line Items]
Fair Value Hierarchy, Number of Input Levels	3	3
Transferred from Level 3 to Level 2 [Member]
Note 5 - Fair Values of Financial Instruments (Details) [Line Items]
Number of Investments Transferred Between Levels	1	5
Private Equity Investment [Member]
Note 5 - Fair Values of Financial Instruments (Details) [Line Items]
Number of Level 3 Investments Reported at Fair Value	1	1
Debt Securities [Member]
Note 5 - Fair Values of Financial Instruments (Details) [Line Items]
Number of Level 3 Investments Reported at Fair Value	2	2