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Note 3 - Short Term Investments Available for Sale - Securities in a Continuous Unrealized Loss Position (Details)
Dec. 31, 2017
USD ($)
Fair value $ 12,724,020
Unrealized holding gains (losses) (10,164)
Corporate Bond Securities [Member]  
Short-term investments with unrealized gains, fair value 748,148
Short-term investments with unrealized gains, unrealized holding gains (losses) 570
Short-term investments with unrealized losses, fair value 11,975,872
Short-term investments with unrealized losses, unrealized holding gains (losses) $ (10,734)