Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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The maximum awards to each employee under the plan per period.

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Note 11 - Equity Plans (Details Textual) - USD ($)			1 Months Ended	3 Months Ended		12 Months Ended
Note 11 - Equity Plans (Details Textual) - USD ($)	Jan. 01, 2020	Jan. 01, 2019	Jan. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Chief Executive Officer [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee			$ 1,100,000
Chief Financial Officer [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee			300,000
President and Chief Operating Officer [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee			$ 600,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				35,558	20,604
Restricted Stock Units (RSUs) [Member] \| Senior Management Stock Incentive Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				5 years
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Participant's Base Salary				10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee				$ 17,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						0
Restricted Stock Units (RSUs) [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				20,000
Restricted Stock Units (RSUs) [Member] \| Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value				$ 80,000		$ 80,000
Restricted Stock Units (RSUs) [Member] \| Non-Employee Director [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				1 year
Restricted Stock Units (RSUs) [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		51,506
Restricted Stock Units (RSUs) [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		14,891
Restricted Stock Units (RSUs) [Member] \| President and Chief Operating Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	15,694
Performance Shares [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				20,000
Minimum Percentage of EBITDA Divided by Average Accounts Receivable, Inventory and Property, Plant and Equipment to Vest			5.00%
Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)				1,400,000