Note 10 - Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	2021
Expected term (based upon historical experience) (in years)	5.5	-	5.8
Expected volatility	117	-	159%
Expected dividends		None
Risk free interest rate	0.73	-	1.24%

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

Options Outstanding						Options Exercisable
Exercise Prices		Number of shares		Weighted Average Remaining contractual Life (In Years)		Number of shares		Weighted Average Remaining contractual Life (In Years)
$	0.98		19,500		2.11		19,500		2.11
$	1.91		10,000		8.25		6,667		8.25
$	2.21		7,000		8.45		4,666		8.45
$	2.68		5,300		8.87		1,767		8.87
$	2.89		105,000		7.87		78,333		7.87
$	2.92		52,500		6.13		52,500		6.13
$	3.00		52,500		6.62		52,500		6.62
$	3.30		37,500		4.75		37,500		4.75
$	3.50		3,000		5.76		3,000		5.76
$	4.10		78,700		5.23		78,700		5.23
			371,000		6.28		335,133		6.10

The 2018 Non-qualified Stock Option Plan [Member]

Notes Tables

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

	Number of shares		Weighted average exercise price per share
Options outstanding at January 1, 2022		314,000	$	3.17
Granted		-		-
Cancelled/Expired		-		-
Exercised		-		-
Options outstanding at December 31, 2022		314,000	$	3.17

	Number of shares			Weighted average exercise price per share
Options outstanding at January 1, 2022		36,000		$	0.98
Granted		-			-
Cancelled		(2,000	)		0.98
Exercised		(20,000	)		0.98
Options outstanding at December 31, 2022		14,000		$	0.98

	Number of shares		Weighted average exercise price per share
Options outstanding at January 1, 2022		43,000	$	3.00
Granted		-		-
Cancelled		-		-
Exercised		-		-
Options outstanding at December 31, 2022		43,000	$	3.00

	Number of shares			Weighted average exercise price per share
Options outstanding at January 1, 2022		10,000		$	0.98
Granted		-			-
Cancelled/Expired		(10,000	)		0.98
Exercised		-			-
Options outstanding at December 31, 2022		-		$	-

	Number of Shares			Weighted Average Price		Weighted Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value
Options outstanding at January 1, 2022		403,000		$	2.90
Granted		-			-
Cancelled/Expired		(12,000	)		0.98
Exercised		(20,000	)		0.98
Options outstanding and expected to vest at December 31, 2022		371,000		$	3.07		6.28	$	6,838
Options exercisable at December 31, 2022		335,133		$	3.10		6.10	$	6,338