Equity Incentive Plans (Restricted stock unit award activity) (Details) - Restricted stock awards - C3J Stock Plan 2016	6 Months Ended
	Jun. 30, 2026 $ / shares shares
Shares
Outstanding at beginning of period (in shares) | shares	152,500
Vested (in shares) | shares	(17,500)
Outstanding at end of period (in shares) | shares	135,000
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