Note 6 - Fair Value of Measurements (Details) - Assets and Liabilities at Fair Value on a Recurring Basis (USD $)	Jun. 30, 2013	Dec. 31, 2012
As of June 30, 2013
Fair value on the balance sheet	$ 4,733,817	$ 4,283,932
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Fair value on the balance sheet	42,706,769	8,037,620
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Fair value on the balance sheet	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Fair value on the balance sheet	0	0
Corporate Debt Securities [Member]
Assets:
Fair value on the balance sheet	42,706,769	8,037,620
Fair Value, Inputs, Level 1 [Member]
As of June 30, 2013
Fair value on the balance sheet	0	0
Fair Value, Inputs, Level 2 [Member]
As of June 30, 2013
Fair value on the balance sheet	0	0
Fair Value, Inputs, Level 3 [Member]
As of June 30, 2013
Fair value on the balance sheet	$ 4,733,817	$ 4,283,932