Note 3 - Liquidity and Going Concern (Details Textual) - USD ($)		6 Months Ended
	Apr. 23, 2021	Jun. 30, 2021	Jun. 30, 2020	Apr. 30, 2021	Apr. 22, 2021	Dec. 31, 2017
Cumulative Net Loss		$ (13,000,000)
Proceeds from Sale of Buildings		$ 3,500,000	$ 0
PNC [Member] | PNC Agreements [Member]
Debt Instrument, Covenant, Required Forbearance Reserve	$ 2,525,000				$ 1,025,000
Debt Instrument, Forbearance Fee	1,000,000
Debt Instrument, Increase (Decrease) in Forbearance Fee if Equity Issuance Occurs	(250,000)
Debt Instrument, Forbearance Fee if Equity Issuance Occurs	750,000
Debt Instrument, Increase (Decrease) in Forbearance Fee if Full Cash Payments Received	(500,000)
Debt Instrument, Forbearance Fee if Full Cash Payments Received	250,000
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	9,000,000					$ 18,000,000
Debt Instrument, Covenant, Required Proceeds from Equity Issuance	$ 1,500,000
Debt Instrument, Covenant, Percentage of Total Proceeds from Equity Issuance Required	100.00%
PNC [Member] | PNC Agreements [Member] | Term Loan [Member]
Long-term Debt, Total	$ 2,000,000
Lake Barrington Facility Lease [Member]
Lessee, Operating Lease, Term of Contract (Year)	10 years			10 years
Lessee, Operating Lease, Annual Base Rent on First Year	$ 500,000			$ 500,000
Lessee, Operating Lease, Annual Base Rent on Last Year	652,386			$ 652,386
Lake Barrington Facility [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Consideration	3,500,000
Proceeds from Sale of Buildings	2,000,000
Financing Receivable, before Allowance for Credit Loss, Total	$ 1,500,000