Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 3,274,125	$ 2,375,817
Accounts receivable	1,289,936	1,596,886
Inventories	701,411	744,793
Prepaids and other current assets	220,930	1,023,129
Total current assets	5,486,402	5,740,625
Long-term assets
Restricted cash	858,268	840,049
Property, plant and equipment, net	2,010,374	2,024,486
Capitalized lease disposal costs, net	218,814	228,125
Financing lease right-of-use asset	9,616	12,621
Operating lease right-of-use asset	2,248,642	2,311,082
Goodwill	1,384,255	1,384,255
Patents and other intangibles, net	3,620,905	3,703,353
Total long-term assets	10,350,874	10,503,971
Total assets	15,837,276	16,244,596
Current liabilities
Accounts payable	541,874	382,392
Accrued liabilities	1,119,693	1,472,504
Unearned revenue	835,854	879,365
Current portion of operating lease right-of-use liability	136,075	131,572
Current portion of financing lease liability	2,996	5,513
Total current liabilities	3,266,907	3,514,694
Long-term liabilities
Accrued long-term liabilities	93,750	112,500
Asset retirement obligation	968,577	942,378
Financing lease liability, net of current portion	1,309	2,832
Operating lease right-of-use liability, net of current portion	2,163,061	2,232,244
Mandatorily redeemable convertible preferred stock	4,063,000	4,063,000
Total long-term liabilities	8,318,797	8,387,360
Total liabilities	11,585,704	11,902,054
Stockholders' equity
Common stock, $0.01 par value; 750,000,000 shares authorized; 517,941,366 and 514,889,916 shares issued and outstanding respectively	5,179,414	5,148,899
Additional paid in capital	125,944,357	125,654,486
Accumulated deficit	(126,872,199)	(126,460,843)
Total equity	4,251,572	4,342,542
Total liabilities and stockholders' equity	15,837,276	16,244,596
Related Party [Member]
Current liabilities
Current installments of notes payable	620,000	620,000
Long-term liabilities
Notes payable, net of current portion	1,000,000	1,000,000
Nonrelated Party [Member]
Current liabilities
Current installments of notes payable	10,415	23,348
Long-term liabilities
Notes payable, net of current portion	$ 29,100	$ 34,406