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COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Details) (Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 06, 2020
Dec. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Aggregate cost   $ 6,380 $ 6,380 $ 6,483
Net unrealized losses   1,413 258 1,563
Gross unrealized losses     789 1,703
Gross unrealized gains     531 140
Marketable equity securities   2,884 2,884 2,560
Purchase of franklin property $ 6,500   $ 316  
Cash paid to purchase Franklin Property 1,300      
Building [Member]        
Useful life     30 years  
Financed through Minnesota Bank & Trust [Member]        
Cash paid to purchase Franklin Property $ 5,200      
Air T, Inc. [Member]        
Marketable equity securities   $ 1,510 $ 1,510 $ 847