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Note 1 - Basis of Presentation (Details Textual) - USD ($)
 3 Months Ended
Feb. 02, 2023
Feb. 01, 2023
Nov. 09, 2022
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Net Income (Loss) Attributable to Parent       $ (10,691,000) $ (5,912,000)  
Working Capital       24,000,000.0    
Net Cash Provided by (Used in) Operating Activities       (4,069,000) (3,222,000)  
Gain (Loss) on Extinguishment of Debt       (5,331,000) 0  
Repayments of Long-Term Debt   $ 15,000,000   15,047,000 35,000  
Dividends Payable, Current       1,265,000   $ 1,288,000
ATEC Acquisition [Member]            
Business Combination, Consideration Transferred     $ 2,200,000      
Series A Preferred Stock [Member]            
Dividends Payable, Current         $ 1,270,000  
First Amended Credit Agreement 1 [Member]            
Repayments of Debt       15,000,000    
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 4.80          
First Amended Credit Agreement 1 [Member] | Maximum [Member]            
Debt Conversion, Original Debt, Amount $ 15,000,000          
Senior Secured Debt [Member]            
Interest Paid, Excluding Capitalized Interest, Operating Activities       537,000    
Paid-in-Kind Interest, Payable       $ 166,000    
Private Placement [Member] | Direct Offering [Member]            
Stock Issued During Period, Shares, New Issues (in shares)       10,500,000    
Shares Issued, Price Per Share (in dollars per share)       $ 3.84    
Proceeds from Issuance of Common Stock, Gross       $ 40,320,000    
Proceeds from Issuance of Common Stock, Net       $ 38,500,000