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Note 14 - Subsequent Events (Details Textual) - USD ($)
Nov. 12, 2019
Mar. 31, 2020
Jan. 01, 2020
Dec. 01, 2019
Sep. 30, 2019
Subsequent Event [Member] | Warrant In Connection With Amended Subordinated Loan [Member]          
Warrants and Rights Outstanding, Term 5 years        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 625,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.20        
Fourth Amendment to Loan and Security Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]          
Line of Credit, Apprasied Value of Eligible Equipment, Advance Rate         85.00%
Fourth Amendment to Loan and Security Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member] | Forecast [Member]          
Line of Credit, Apprasied Value of Eligible Equipment, Advance Rate   80.00% 85.00% 90.00%  
Fourth Amendment to Loan and Security Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]          
Line of Credit, Apprasied Value of Eligible Equipment, Advance Rate 92.50%        
Line of Credit Facility, Covenant Compliance, Minimum Liquidity $ 1,500,000        
Line of Credit Facility, Covenant Compliance, Trailing Twelve Month Fixed Charge Coverage Ratio 120.00%        
Amended Subordinated Loan [Member] | Cross River Partners, L.P. [Member] | Subordinated Debt [Member]          
Debt Instrument, Face Amount         $ 2,000,000
Amended Subordinated Loan [Member] | Cross River Partners, L.P. [Member] | Subsequent Event [Member] | Subordinated Debt [Member]          
Debt Instrument, Increase (Decrease), Net, Total $ 500,000        
Debt Instrument, Face Amount $ 2,500,000