Equity Incentive Plans (Restricted stock award and restricted stock unit award activity) (Details) - Restricted stock awards - C3J Stock Plan 2016	3 Months Ended
	Mar. 31, 2025 $ / shares shares
Shares
Outstanding at beginning of period (in shares) | shares	220,000
Vested (in shares) | shares	(17,500)
Outstanding at end of period (in shares) | shares	202,500
Weighted Avg Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 2.73
Vested (in dollars per shares) | $ / shares	3.38
Outstanding at end of period (in dollars per share) | $ / shares	$ 2.65