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Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Cash and cash equivalents $ 3,899 $ 4,313
Accounts receivable 4,579 1,264
Inventory Valuation Reserves 1,040 1,040
Tax Credit Sales receivable 55,164 0
Prepaid expenses 2,895 4,248
Other current assets 3,811 3,653
Property, plant and equipment, net 188,076 180,441
Operating lease right-of-use assets 2,159 2,449
Other assets 8,713 6,088
Accounts payable 28,800 26,168
Short term borrowings 42,415 36,754
Current portion of operating lease liability 390 338
Other current liabilities 12,746 7,268
Other long term debt 20,288 11,678
Operating lease liability $ 1,890 $ 2,189
Common Stock, Par Value (in dollars per share) $ 0.001 $ 0.001
Common Stock, Shares Authorized (in shares) 80,000 80,000
Common Stock, Shares Issued (in shares) 39,388 35,869
Common Stock, Shares Outstanding (in shares) 39,388 35,869
Series B Convertible Preferred Stock [Member]    
Series B Preferred Stock, Par Value (in dollars per share) $ 0.001 $ 0.001
Series B Preferred Stock, Authorized (in shares) 7,235 7,235
Series B Preferred Stock, Shares Issued (in shares) 1,260 1,270
Series B Preferred Stock, Shares Outstanding (in shares) 1,260 1,270
Aggregate Liquidation Preference $ 3,780 $ 3,810
Convertible Series B Preferred Stock Subject to Mandatory Redemption [Member]    
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent 137,778 116,000
Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents 139 165
Accounts receivable 73 165
Tax Credit Sales receivable 55,164 0
Prepaid expenses 1,937 858
Other current assets 401 725
Property, plant and equipment, net 75,284 71,633
Operating lease right-of-use assets 165 224
Other assets 5,267 3,458
Accounts payable 7,103 9,192
Short term borrowings 23,942 19,831
Current portion of operating lease liability 46 41
Other current liabilities 1,614 645
Other long term debt 9,230 31
Operating lease liability 80 115
Variable Interest Entity, Primary Beneficiary [Member] | Convertible Series B Preferred Stock Subject to Mandatory Redemption [Member]    
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent $ 137,778 $ 116,000