Equity Incentive Plans (Restricted stock award and restricted stock unit award activity) (Details) - Restricted stock awards - C3J Stock Plan 2016	12 Months Ended
	Dec. 31, 2024 $ / shares shares
Shares
Outstanding at beginning of period (in shares) | shares	200,000
Granted (in shares) | shares	90,000
Vested (in shares) | shares	(50,000)
Cancelled (in shares) | shares	(20,000)
Outstanding at end of period (in shares) | shares	220,000
Weighted Avg Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 2.39
Granted (in dollars per share) | $ / shares	3.38
Vested (in dollars per shares) | $ / shares	2.39
Cancelled (in dollars per share) | $ / shares	3.38
Outstanding at end of period (in dollars per share) | $ / shares	$ 2.73