Note 5 - Marketable Securities - Fair Value of Marketable Securities (Details) - USD ($)
Dec. 31, 2016
Mar. 31, 2016
Total $ 84,323,941 $ 85,392,719
Less than 1 Year 24,655,206  
1-3 Years 36,400,319  
3-5 Years $ 23,268,416