Equity Incentive Plans (Restricted stock award) (Details) - Restricted Stock [Member] - C3J Stock Plan 2016 [Member]	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Shares
Outstanding at beginning of period (in shares) | shares	343,493
Forfeited/Cancelled (in shares) | shares	(3,329)
Outstanding at end of period (in shares) | shares	340,164
Weighted Avg Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 21.83
Forfeited/Cancelled (in dollars per share) | $ / shares	16.14
Outstanding at end of period (in dollars per share) | $ / shares	$ 21.91