Note J - Stock Option Plans (Details Textual) - USD ($)		12 Months Ended
	Apr. 23, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2016	Dec. 12, 2021	Dec. 31, 2019	Jun. 30, 2011
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)		2,066,343	2,428,329			2,375,760
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Amount Capitalized		$ 763,000	$ 537,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 3,200,000	$ 0.9
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		3 years 5 months 26 days	2 years 11 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)		$ 1.56	$ 1.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 290,688	$ 330,231
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)		1.15
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum		69.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum		95.16%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Employee [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)		3 years
Share Price (in dollars per share)					$ 2.13
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Employee [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)		6 years 6 months
Share Price (in dollars per share)		$ 3.79
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum		86.97%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum		94.05%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%
Share-based Payment Arrangement, Expense		$ 27,600	$ 13,600
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum			0.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum		0.50%
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Minimum [Member]
Share Price (in dollars per share)		$ 1.65
Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Maximum [Member]
Share Price (in dollars per share)		$ 1.75
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 159,375
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 4 months 17 days
Share-based Payment Arrangement, Expense		$ 70,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		116,399	0
Restricted Stock [Member] | Territory Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		2 years
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)		96,551
Stock Option Plan 2011 [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)				4,000,000			2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				5 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)		811,597	424,425
The 2020 Equity Incentive Plan [Member] | Vice Chairman of the Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	2,000,000
The 2020 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		5 years
The 2020 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Vice Chairman of the Board of Directors [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
The 2020 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Vice Chairman of the Board of Directors [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	10 years