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Note 7 - Accrued Liabilities and Other Liabilities - Noncurrent (Details) - Changes in Warranty Reserve (USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Changes in Warranty Reserve [Abstract]    
Beginning balance $ 314,311us-gaap_ProductWarrantyAccrual $ 212,759us-gaap_ProductWarrantyAccrual
Warranty provision 19,198us-gaap_ProductWarrantyAccrualWarrantiesIssued 14,361us-gaap_ProductWarrantyAccrualWarrantiesIssued
Warranty settlements (8,402)us-gaap_ProductWarrantyAccrualPayments (11,362)us-gaap_ProductWarrantyAccrualPayments
Ending balance $ 325,107us-gaap_ProductWarrantyAccrual $ 215,758us-gaap_ProductWarrantyAccrual