Note 5 - Investment Securities - Available For Sale (Details) - Short-term Investment - Continuous Unrealized Loss Position (Debt Securities [Member], USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Debt Securities [Member]
Available for Sale
Bonds – corporate issuances (all unrealized holding losses are less than 12 months at date of measurement)	$ 42,706,769
Bonds – corporate issuances (all unrealized holding losses are less than 12 months at date of measurement)	(213,841)
Bonds – corporate issuances (all unrealized holding losses are less than 12 months at date of measurement)		(126,607)
Bonds – corporate issuances (all unrealized holding losses are less than 12 months at date of measurement)		$ 8,037,620