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Note 3 - Short Term Investments Available for Sale - Investment Securities Gross Unrealized Losses and Fair Value by Investment Category (Details)
Dec. 31, 2015
USD ($)
Available for sale (all unrealized holding gains and losses are less than 12 months at date of measurement)  
Total $ 10,799,890
Total (3,858)
Certificates of Deposit [Member]  
Available for sale (all unrealized holding gains and losses are less than 12 months at date of measurement)  
Short-term investments with unrealized gains 240,024
Short-term investments with unrealized gains 24
Short-term investments with unrealized losses 4,558,786
Short-term investments with unrealized losses (1,214)
Corporate Bond Securities [Member]  
Available for sale (all unrealized holding gains and losses are less than 12 months at date of measurement)  
Short-term investments with unrealized losses 6,001,080
Short-term investments with unrealized losses $ (2,668)