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Note 11 - Held-to-maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Due in one year or less, amortized cost	$ 50,571	$ 59,113
Due in one year or less, fair market value	50,466	59,194
Due after one year through five years, amortized cost	86,668	60,908
Due after one year through five years, fair market value	85,338	61,113
Due after five years through ten years, amortized cost	0	0
Due after five years through ten years, fair market value	0	0
Total held to maturity securities, amortized cost	137,239	120,021
Total held to maturity securities, fair market value	135,804	120,307
Less current portion, amortized cost	50,571	59,113
Less current portion, fair market value	50,466	59,194
Long term held to maturity securities, amortized cost	86,668	60,908
Long term held to maturity securities, fair market value	$ 85,338	$ 61,113

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The current portion of fair value of investments in debt securities classified as held-to-maturity.

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The non-current portion of fair value of investments in debt securities classified as held-to-maturity.

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