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Note 4 - Debt (Details Textual)		1 Months Ended	3 Months Ended
Note 4 - Debt (Details Textual)	Sep. 30, 2021 USD ($)	Jan. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2019 USD ($)
Share Price (in dollars per share) \| $ / shares		$ 3.32
Conversion of Related Party Debt to Equity [Member]
Debt Conversion, Original Debt, Amount		$ 600,000
Debt Conversion, Converted Instrument, Shares Issued (in shares) \| shares		181,000
John H Schwan [Member]
Repayments of Related Party Debt			$ 0
Interest Expense, Related Party			18,000	$ 16,000
Term Loan [Member]
Long-Term Debt, Total			0.6		$ 600,000
Interest Payable					700,000
Debt Issuance Costs, Net, Total					100,000
Line of Credit [Member] \| Revolving Credit Facility [Member]
Long-Term Debt, Total			5,158,000		5,003,000
Promissory Note [Member] \| John H Schwan [Member]
Due to Related Parties, Noncurrent, Total		$ 1,000,000	1,200,000		1,200,000	$ 1,600,000
Repayments of Related Party Debt			0	0
Interest Expense, Related Party			18,000	$ 17,000
Promissory Note [Member] \| Alex Feng [Member]
Due to Related Parties, Noncurrent, Total			$ 200,000		$ 200,000
Debt Instrument, Interest Rate, Stated Percentage			3.00%
Line Financial Agreement [Member]
Debt Instrument, Number of Installments for Periodic Payment	48
Debt Instrument, Periodic Payment, Total	$ 15,000
Debt Instrument, Collateral Monitoring Fee, Percent	4.62%
Debt Instrument, Fee Amount, Percent	1.25%
Debt Instrument, Extension Term (Year)	1 year
Debt Instrument, Renewal Fee, Percent	1.25%
Debt Instrument, Covenant, Tangible Net Worth	$ 4,000,000
Line Financial Agreement [Member] \| Maximum [Member]
Debt Instrument, Covenant, Expenditures Amount	$ 1,000,000
Line Financial Agreement [Member] \| Prime Rate [Member]
Debt Instrument, Reference Rate			3.50%
Debt Instrument, Basis Spread on Variable Rate	1.95%
PNC [Member] \| PNC Agreements [Member] \| Term Loan [Member]
Debt Instrument, Face Amount	$ 6,000,000
Line Financial [Member] \| Line Financial Agreement [Member] \| Term Loan [Member]
Debt Instrument, Face Amount	$ 700,000