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Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
shares in Thousands
Mar. 31, 2023
Dec. 31, 2022
Cash and cash equivalents $ 4,131,000 $ 4,313,000
Accounts receivable 261,000 1,264,000
Inventory Valuation Reserves 1,040,000 1,040,000
Prepaid expenses 1,502,000 4,248,000
Other current assets 2,792,000 3,653,000
Property, plant and equipment, net 180,808,000 180,441,000
Operating lease right-of-use assets 2,355,000 2,449,000
Other assets 5,994,000 6,088,000
Accounts payable 28,508,000 26,168,000
Short term borrowings 45,282,000 36,754,000
Current portion of operating lease liability 355,000 338,000
Other long term debt 11,479,000 11,678,000
Operating lease liability $ 2,095,000 $ 2,189,000
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) 36,690 35,869
Common Stock, Shares Outstanding (in shares) 36,690 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) 1,270 1,270
Series B Preferred Stock, Shares Outstanding (in shares) 1,270 1,270
Aggregate Liquidation Preference $ 3,810,000 $ 3,810,000
Convertible Series B Preferred Stock Subject to Mandatory Redemption [Member]    
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent 122,546,000 116,000,000
Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents 1,042,000 165,000
Accounts receivable 73,000 165,000
Prepaid expenses 470 858
Other current assets 127,000 725,000
Property, plant and equipment, net 70,636,000 71,633,000
Operating lease right-of-use assets 204,000 244,000
Other assets 3,458,000 3,458,000
Accounts payable 7,660,000 9,192,000
Short term borrowings 21,737,000 19,831,000
Current portion of operating lease liability 43,000 41,000
Other long term debt 29,000 31,000
Operating lease liability 104,000 115,000
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 $ 122,546,000 $ 116,000,000