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Note 14 - Business Segments - Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Net Revenue $ 10,171 $ 6,841  
Operating Income / (loss) 970 (327)  
Assets 40,111 35,828 $ 38,306
Depreciation and amortization 709 702  
Capital expenditures 438 87  
Manufacturing [Member]      
Net Revenue 3,562 2,625  
Operating Income / (loss) 300 (18)  
Assets 18,558 10,383  
Depreciation and amortization 103 106  
Capital expenditures 60 67  
Testing Services [Member]      
Net Revenue 4,600 2,954  
Operating Income / (loss) 536 (337)  
Assets 18,363 20,848  
Depreciation and amortization 585 579  
Capital expenditures 377 20  
Distribution [Member]      
Net Revenue 1,998 1,258  
Operating Income / (loss) 254 124  
Assets 1,288 758  
Depreciation and amortization 2 0  
Real Estate Segment [Member]      
Net Revenue 11 4  
Operating Income / (loss) (23) (27)  
Assets 1,588 3,722  
Depreciation and amortization 19 17  
Capital expenditures 1    
Fabrication [Member]      
Operating Income / (loss) 0 0  
Assets 0 25  
Depreciation and amortization 0 0  
Corporate and Unallocated [Member]      
Operating Income / (loss) (97) (69)  
Assets 314 92  
Depreciation and amortization $ 0 $ 0