XML 55 R41.htm IDEA: XBRL DOCUMENT v3.6.0.2
Note 3 - Short Term Investments Available for Sale - Short-term Investment by Bond Maturities (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Short-term investments, fair value   $ 10,799,890
Total short-term investments $ 1,680,000 10,803,748
Total short-term investments 1,680,000 10,799,890
Certificate of Deposit [Member]    
Short-term investments, cost 1,680,000 4,800,000
Short-term investments, fair value 1,680,000 4,798,810
Investment Maturing Within Three Months [Member]    
Total short-term investments 1,680,000 10,803,748
Total short-term investments 1,680,000 10,799,890
Corporate Debt Securities [Member]    
Short-term investments, cost 6,003,748
Short-term investments, fair value 6,001,080
Investment Maturing Between 3 and 12 Months [Member]    
Total short-term investments
Total short-term investments