Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 2,191,108	$ 2,688,141
Accounts receivable	1,135,987	1,469,298
Inventories	699,271	927,111
Prepaids and other current assets	309,676	672,934
Total current assets	4,336,042	5,757,484
Long-term assets
Restricted cash	1,396,423	880,752
Property, plant and equipment, net	2,567,123	2,465,077
Capitalized lease disposal costs, net	663,874	688,462
Financing lease right-of-use asset	3,606	6,611
Operating lease right-of-use asset	2,117,044	2,183,988
Goodwill	1,384,255	1,384,255
Patents and other intangibles, net	3,456,011	3,538,458
Total long-term assets	11,588,336	11,147,603
Total assets	15,924,378	16,905,087
Current liabilities
Accounts payable	312,233	559,597
Accrued liabilities	1,304,889	1,482,179
Unearned revenue	733,505	932,682
Current portion of operating lease right-of-use liability	145,550	140,733
Current portion of financing lease liability	1,309	2,832
Current portion of mandatorily redeemable preferred stock	4,063,000	0
Total current liabilities	6,705,486	3,273,756
Long-term liabilities
Accrued long-term liabilities	56,250	75,000
Asset retirement obligation	1,509,216	1,474,463
Operating lease right-of-use liability, net of current portion	2,017,512	2,091,511
Mandatorily redeemable convertible preferred stock	0	4,063,000
Total long-term liabilities	5,390,078	9,594,706
Total liabilities	12,095,564	12,868,462
Stockholders' equity
Common stock, $0.01 par value; 750,000,000 shares authorized; 522,957,618 and 519,787,870 shares issued and outstanding respectively	5,229,576	5,197,879
Additional paid in capital	126,316,593	126,168,605
Accumulated deficit	(127,717,355)	(127,329,859)
Total equity	3,828,814	4,036,625
Total liabilities and stockholders' equity	15,924,378	16,905,087
Nonrelated Party [Member]
Current liabilities
Current installments of notes payable	145,000	155,733
Long-term liabilities
Notes payable, net of current portion	187,100	270,732
Related Party [Member]
Long-term liabilities
Notes payable, net of current portion	$ 1,620,000	$ 1,620,000