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Note 4 - Fair Value by Major Security Type (Details) - USD ($)
Mar. 31, 2016
Sep. 30, 2015
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Certificates of Deposit [Member]    
Cost Basis $ 3,296,188 $ 3,296,238
Fair Value 3,296,188 3,296,238
Short-term Securities 1,248,466 249,072
Long-term Securities 2,047,722 3,047,166
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Cost Basis 563,991 654,205
Fair Value 564,293 654,498
Short-term Securities 408,816 494,440
Unrealized Gains (Losses) 302 293
Cash Equivalents 155,477 160,058
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Corporate Debt Securities [Member]    
Cost Basis 1,206,931 509,029
Fair Value 1,205,800 508,435
Short-term Securities 976,106 508,435
Long-term Securities 229,694  
Unrealized Gains (Losses) (1,131) (594)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Cost Basis 5,067,110 4,459,472
Fair Value 5,066,281 4,459,171
Short-term Securities 2,633,388 1,251,947
Long-term Securities 2,277,416 3,047,166
Unrealized Gains (Losses) (829) (301)
Cash Equivalents 155,477 160,058
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Cost Basis   301,193
Fair Value   301,193
Cash Equivalents   301,193
Fair Value, Measurements, Nonrecurring [Member]    
Cost Basis   4,760,665
Fair Value   4,760,364
Short-term Securities   1,251,947
Long-term Securities   3,047,166
Unrealized Gains (Losses)   (301)
Cash Equivalents   461,251
Short-term Securities 2,633,388 1,251,947
Long-term Securities $ 2,277,416 $ 3,047,166