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Note 7 - Short-term and Long-term Warranty Reserves (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Short-term warranty reserve	$ 310,258		$ 288,480
Long-term warranty reserve	16,978		25,831
Total warranty reserve	$ 327,236us-gaap_ProductWarrantyAccrual	$ 325,107us-gaap_ProductWarrantyAccrual	$ 314,311us-gaap_ProductWarrantyAccrual	$ 260,208us-gaap_ProductWarrantyAccrual	$ 215,758us-gaap_ProductWarrantyAccrual	$ 212,759us-gaap_ProductWarrantyAccrual

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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