Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Subsequent Events (Details Textual)

v3.21.1
Note 11 - Subsequent Events (Details Textual)
1 Months Ended 3 Months Ended
Apr. 29, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Feb. 15, 2021
USD ($)
ft²
Area of Land Damaged by Fire (Square Foot) | ft²       30,000
Proceeds from Insurance Settlement, Investing Activities   $ 0 $ 4,748,000  
AquaRefining Fire [Member]        
Proceeds from Insurance Settlement, Investing Activities   $ 23,600,000    
AquaRefining Fire [Member] | Subsequent Event [Member]        
Proceeds from Insurance Settlement, Investing Activities $ 1,400,000      
Recycling Facility at TRIC [Member]        
Area of Real Estate Property (Square Foot) | ft²       136,750
Lessor, Operating Lease, Lessee's First Option to Purchase       $ 14,250,000
Lessor, Operating Lease, Lessee's Second Option to Purchase       15,250,000
First Nonrefundable Deposit Subject to Purchase Option       1,250,000
Second Nonrefundable Deposit Subject to Purchase Option       2,000,000
Lessor, Operating Lease, Monthly Payments to be Received       68,000
Lessor, Operating Lease, Monthly Payments to be Received in Last Six Months of Lease Term       $ 100,640