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Note 6 - Sale of Business Component (Details Textual) - USD ($)
12 Months Ended
Dec. 28, 2018
Dec. 31, 2019
Dec. 31, 2018
Gain (Loss) on Disposition of Business   $ 1,140,000
Virginia-based Critical Data Center [Member] | MHW [Member]      
Notes Payable, Total $ 1,595,000    
Virginia-based Critical Data Center [Member] | Innovative Power LLC [Member]      
Disposal Group, Including Discontinued Operation, Consideration 2,500,000    
Disposal Group, Including Discontinued Operation, Intangible Assets 1,176,000    
Disposal Group, Including Discontinued Operation, Assets, Total 3,000    
Disposal Group, Including Discontinued Operations, Amount Placed in Escrow 175,000    
Proceeds from Divestiture of Businesses 2,325,000    
Sale of Business, Expense $ 184,000    
Gain (Loss) on Disposition of Business     $ 1,140,000