Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments (USD $)	Sep. 30, 2014	Dec. 31, 2013
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Marketable securities	$ 19,999,600
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Marketable securities	14,999,600
Fair Value, Inputs, Level 1 [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Marketable securities	14,999,600
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Money market funds	49,285,168	34,266,501
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Marketable securities	5,000,000
Fair Value, Inputs, Level 2 [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Marketable securities	5,000,000
Money Market Funds [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Money market funds	49,285,168	34,266,501
US States and Political Subdivisions Debt Securities [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Marketable securities	14,999,600
Certificates of Deposit [Member]
Note 4 - Fair Value Measurements (Details) - Fair Value of Financial Instruments [Line Items]
Marketable securities	$ 5,000,000