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Note 10 - Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
Jun. 30, 2019
Sep. 30, 2018
Payroll and related $ 1,483,678 $ 2,041,735
Contract liability, current 1,408,469  
Accrued contract costs 508,645 197,034
Severance 152,730
Warranty reserve 131,618 99,216
Deferred rent 102,771 49,467
Total 3,635,181 3,199,864
Deferred Revenue [Member]    
Contract liability, current 490,514 460,086
Customer Deposits [Member]    
Contract liability, current $ 917,955 $ 199,596