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Note 5 - Marketable Securities - Securities in a Continuous Loss Position (Details) - USD ($)
6 Months Ended 12 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Fair market value, less than 12 months $ 22,385,041 $ 33,503,369
Gross unrealized losses, less than 12 months (113,584) (247,149)
Fair market value, greater than 12 months 7,611,641
Gross unrealized losses, greater than 12 months (37,705)
Total fair market value 29,996,682 33,503,369
Total gross unrealized losses (151,289) (247,149)
Corporate Bond Securities [Member]    
Fair market value, less than 12 months 22,385,041 32,198,766
Gross unrealized losses, less than 12 months (113,584) (246,935)
Fair market value, greater than 12 months 7,611,641
Gross unrealized losses, greater than 12 months (37,705)
Total fair market value 29,996,682 32,198,766
Total gross unrealized losses (151,289) (246,935)
Municipal Bonds [Member]    
Fair market value, less than 12 months 1,304,603
Gross unrealized losses, less than 12 months (214)
Fair market value, greater than 12 months
Gross unrealized losses, greater than 12 months
Total fair market value 1,304,603
Total gross unrealized losses $ (214)