Note 8 - Stock Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

				Weighted		Weighted
				Average		Average
	Options			Exercise Price		Contractual		Aggregate
	Activity			(per share)		Term (years)		Intrinsic Value
Balance at January 1, 2023		921,657		$	6.86		8.01	$	—
Granted		700,000		$	0.89
Exercised/released		—		$	—
Cancelled/forfeited		(386,879	)	$	3.54
Balance at December 31, 2023		1,234,778		$	4.52		7.91	$	30,000
Exercisable at December 31, 2023		670,624		$	4.80		7.28	$	—

				Weighted		Weighted
				Average		Average
	Options			Exercise Price		Contractual		Aggregate
	Activity			(per share)		Term (years)		Intrinsic Value
Balance at January 1, 2022		747,800		$	11.51		6.57	$	1,143,013
Granted		628,498		$	5.63
Exercised/released		(76,750	)	$	2.14
Cancelled/forfeited		(377,891	)	$	14.95
Balance at December 31, 2022		921,657		$	6.86		8.01	$	—
Exercisable at December 31, 2022		260,738		$	7.93		4.96	$	—

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Year Ended
	December 31,
	2023			2022
Weighted-average expected volatility		59.43	%		52.88	%
Weighted-average expected term (years)		5.71			6.25
Weighted-average expected risk-free interest rate		3.87	%		2.85	%
Dividend yield		—			—
Weighted-average fair value of options granted	$	0.57		$	2.26

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

				Weighted Average		Weighted Average
				Grant Date Fair		Remaining Vesting		Aggregate
	Number of RSUs			Value (per share)		Term (years)		Fair Value
Balance at January 1, 2023		504,420		$	4.22		2.94	$	2,127,734
Granted		745,000		$	0.81
Exercised/released		(200,085	)	$	3.86
Cancelled/forfeited		(277,450	)	$	2.14
Balance at December 31, 2023		771,885		$	1.77		2.18	$	1,480,161

				Weighted Average		Weighted Average
				Grant Date Fair		Remaining Vesting		Aggregate
	Number of RSUs			Value (per share)		Term (years)		Fair Value
Balance at January 1, 2022		91,438		$	32.91		2.17	$	2,982,931
Granted		552,702		$	4.13
Exercised/released		(62,971	)	$	20.94
Cancelled/forfeited		(76,749	)	$	24.31
Balance at December 31, 2022		504,420		$	4.22		2.94	$	2,127,734

Share-Based Payment Arrangement, Activity [Table Text Block]

				Weighted Average		Weighted Average
				Grant Date Fair		Remaining Vesting		Aggregate
	Number of MSUs			Value (per share)		Term (years)		Fair Value
Balance at January 1, 2023		31,083		$	43.53		0.60	$	1,353,043
Granted		600,000		$	0.08
Exercised/released		—		$	—
Cancelled/forfeited		(9,769	)	$	43.53
Balance at December 31, 2023		621,314		$	1.57		0.60	$	977,558

				Weighted Average		Weighted Average
				Grant Date Fair		Remaining Vesting		Aggregate
	Number of MSUs			Value (per share)		Term (years)		Fair Value
Balance at January 1, 2022		160,301		$	43.53		1.20	$	6,977,903
Granted		—		$	—
Exercised/released		—		$	—
Cancelled/forfeited		(129,218	)	$	43.53
Balance at December 31, 2022		31,083		$	43.53		0.60	$	1,353,043

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

	Year Ended			Unrecognized Compensation Cost Related to Non-Vested Awards as of		Weighted-Average Remaining Vesting Period as of
	December 31, 2023			December 31, 2023		December 31, 2023 (years)
Stock options	$	456,902		$	654,313		2.36
RSUs		658,717			1,099,972		2.17
MSUs		(23,473	)		34,281		0.57
Total stock-based compensation	$	1,092,146		$	1,788,566		2.21
Cost of goods sold	$	503		$	2,976		1.62
General and administrative		849,784			1,666,980		2.29
Sales and marketing		241,859			118,610		0.99
Total stock-based compensation	$	1,092,146		$	1,788,566		2.21

	Year Ended			Unrecognized Compensation Cost Related to Non-Vested Awards as of		Weighted-Average Remaining Vesting Period as of
	December 31, 2022			December 31, 2022		December 31, 2022 (years)
Stock options	$	381,100		$	1,173,758		3.24
RSUs		1,293,628			1,707,145		2.91
MSUs		(1,053,150	)		71,059		1.09
ESPP		9,649			—		—
Total stock-based compensation	$	631,227		$	2,951,962		3.07
Cost of goods sold	$	16,548		$	14,354		2.56
General and administrative		505,729			2,734,728		2.93
Research and product development		(5,120	)		2,517		0.73
Sales and marketing		114,070			200,363		3.84
Total stock-based compensation	$	631,227		$	2,951,962		3.07