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Note 9 - Stockholders' Equity (Details Textual)			1 Months Ended	3 Months Ended	12 Months Ended
Note 9 - Stockholders' Equity (Details Textual)	May 26, 2020 USD ($) $ / shares shares	Apr. 23, 2016	Aug. 31, 2019 $ / shares shares	Mar. 31, 2021 shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Oct. 01, 2018 $ / shares	Sep. 06, 2017 USD ($)	Jun. 22, 2017 $ / shares shares	Sep. 17, 2014 USD ($)	Jun. 07, 2012 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)					1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price, Ending Balance (in dollars per share) \| $ / shares					$ 1.96	$ 1.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)					957,000
Share-based Payment Arrangement, Expense \| $					$ 1,854,000	$ 1,984,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)					4,381,348	3,758,670
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)					4 years 3 months 18 days	4 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)					100,278	22,373
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) \| $ / shares					$ 2.27	$ 3.35
Minimum Percentage of Outstanding Common Stock Acquired	4.90%
Stock Repurchase Program, Authorized Amount \| $								$ 3,000,000.0		$ 1,000,000.0	$ 2,000,000.0
Stock Repurchased During Period, Shares (in shares)					0	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount \| $					$ 2,300,000
Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.019
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.74
AWI Warrant [Member]
Warrants and Rights Outstanding, Term (Year)	7 years
AWI Warrants First One-third [Member]
Minimum Price of Common Stock Weighted Average Closing Price (in dollars per share) \| $ / shares							$ 30.00
AWI Warrants Second One-third [Member]
Minimum Price of Common Stock Weighted Average Closing Price (in dollars per share) \| $ / shares							37.50
AWI Warrants Last One-third [Member]
Minimum Price of Common Stock Weighted Average Closing Price (in dollars per share) \| $ / shares							$ 45.00
AWI [Member]
Equity Method Investment, Ownership Percentage	15.00%
Series A Junior Participating Preferred Stock [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 20.00
Series B Preferred Stock [Member] \| AWI Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 1.72
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	148,240
Warrants and Rights Outstanding \| $	$ 2,500,000
Common Stock [Member] \| AWI Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares									$ 18.45
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									1,482,400
Service-based Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price, Ending Balance (in dollars per share) \| $ / shares					$ 1.96	$ 1.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)					957,000	635,000
Share-based Payment Arrangement, Expense \| $					$ 1,417,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)					4,031,348
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)					7 months 6 days
Service-based Option [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.33%
Service-based Option [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.33%
Service-based Option [Member] \| Share-based Payment Arrangement, Employee [Member] \| Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					33.33%
Service-based Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)					7 years
Service-based Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)					10 years
Market Condition Option [Member] \| Officer [Member] \| Equity Incentive Plan 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)					7 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			455,000
Share-based Payment Arrangement, Expense \| $					$ 111,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)					355,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)					7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares			$ 1.69
Service-based Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expense \| $					$ 351,074
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)					185,082
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms (Year)					2 years 2 months 12 days
Service-based Restricted Stock Awards [Member] \| Share-based Payment Arrangement, Employee [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares)				220,000
Service-based Restricted Stock Awards [Member] \| Share-based Payment Arrangement, Employee [Member] \| Executive Officer [Member] \| First Anniversary of the Date of Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Restriction, Percentage		33.33%
Service-based Restricted Stock Awards [Member] \| Share-based Payment Arrangement, Employee [Member] \| Executive Officer [Member] \| Second Anniversary of the Date of Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Restriction, Percentage		33.33%
Service-based Restricted Stock Awards [Member] \| Share-based Payment Arrangement, Employee [Member] \| Executive Officer [Member] \| Third Anniversary of the Date of Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Restriction, Percentage		33.33%